Unveiling the Fifth Dimension: A Novel Approach to Quantum Mechanics

Abstract

Quantum mechanics (QM) has long challenged our understanding of time, space, and reality, with phenomena such as superposition, wave–particle duality, and quantum entanglement defying classical notions of causality and locality. Despite the predictive success of QM, its interpretations—such as the Copenhagen and many-worlds interpretations—remain contentious and incomplete. This paper introduces Strip Theory, a novel framework that reconceptualises time as a two-dimensional manifold comprising foretime, the sequential dimension, and sidetime, an orthogonal possibility dimension representing parallel quantum outcomes. By incorporating sidetime, the theory provides a unified explanation for quantum superposition, coherence, and interference, resolving ambiguities associated with wavefunction collapse. The methods involve extending the mathematical formalism of QM into a five-dimensional framework, where sidetime is explicitly encoded alongside spatial and sequential temporal dimensions. The principal findings demonstrate that this model reproduces all measurable results of QM while addressing foundational issues, offering a clearer and more deterministic interpretation of quantum phenomena. Furthermore, the framework provides insights into quantum coherence, wave–particle duality, and the philosophical implications of free will. These results suggest that Strip Theory can serve as a bridge between interpretations and provide a deeper understanding of time and reality, advancing both theoretical and conceptual horizons.

1. Introduction

The foundations of quantum mechanics (QM) continue to inspire profound questions about the nature of reality, time, and the fabric of the universe. While QM has achieved unparalleled success in describing phenomena at the smallest scales, its interpretations remain fragmented and contentious. Core principles, such as superposition and wavefunction collapse, raise philosophical and physical challenges, particularly in reconciling QM with the relativistic framework of general relativity (GR) [1]. These unresolved tensions point to the need for a deeper, unified understanding of time, space, and quantum phenomena.

One area of active debate lies in the nature of time. Traditional interpretations consider time as a single linear dimension; however, this view struggles to fully address quantum phenomena such as superposition, entanglement, and interference. Itzhak Bars’ Two-Time Physics framework [2] has explored multidimensional time for over two decades, focusing on higher-dimensional gauge symmetries and relativistic systems. While Bars’ work primarily addresses 4+2-dimensional models with symmetry-based structures, Strip Theory offers a non-relativistic framework tailored specifically to quantum mechanics. The introduction of an extra time dimension in Strip Theory is distinct in its application to resolving quantum anomalies such as wavefunction collapse and uncertainty.

This paper introduces Strip Theory, a novel framework that redefines time as a two-dimensional entity comprising sequential time (foretime) and an orthogonal dimension of possibilities (sidetime). By incorporating sidetime, this model naturally explains phenomena such as superposition, wave–particle duality, and quantum interference. It extends the quantum framework into a five-dimensional manifold that integrates spatial dimensions, foretime, and sidetime, offering a unified approach to quantum mechanics that aligns with observed phenomena while addressing foundational ambiguities. In this framework, the term clone describes a parallel instance of a quantum system in sidetime, contributing to the probabilistic outcomes observed in quantum mechanics. Similarly, wavicle describes the dual wave–particle nature of quantum systems in Strip Theory. Wave behaviour arises from sidetime dynamics, while particle behaviour emerges from foretime interactions.

In Strip Theory, time is conceptualised as having two orthogonal dimensions: foretime and sidetime. Foretime represents the sequential progression of events, analogous to the traditional flow of time as experienced by an observer. It governs the observable, stepwise evolution of quantum systems over time. Sidetime can be thought of as a “possibility axis”, existing alongside foretime. It governs the distribution of potential quantum outcomes and supports coherence between multiple quantum clones. Sidetime allows particles to exhibit wave-like interference and superposition by encoding alternate quantum states that are realised across multiple timelines.

To visualise this concept, imagine a wide river with multiple streams. The direction of the river’s current represents foretime, while the parallel paths of the various streams represent sidetime. An observer measuring a particle’s position interacts with a single stream (a clone), but the broader quantum behaviour arises from the relationship between all streams in sidetime. This dual-time structure enables Strip Theory to reinterpret key quantum phenomena, such as uncertainty and wave–particle duality, in a unified framework.

The aim of this paper is to demonstrate how Strip Theory addresses key challenges in quantum mechanics by redefining time and introducing a possibility dimension. By redefining time and introducing a possibility dimension, the framework bridges gaps between quantum mechanics and our broader understanding of the universe. This paper highlights the implications of Strip Theory for superposition, decoherence, wave–particle duality, and more, paving the way for a deeper understanding of quantum reality.

2. Foundation

2.1. Thought Experiment

• 2.1.1. To examine the fundamental nature of time, consider a thought experiment modelling the universe as a sequence of discrete states or “snapshots”, (f₁, f₂, f₃, … f_n). Each snapshot f_i represents the complete state of the universe at a distinct moment t, with t_i < t_i+1 for all i, and a finite time interval Δt = t_i+1 − t_i between consecutive states. The change between two snapshots f_i and f_j (with j > i) is represented by the difference in their respective states, Δf_ij = f_j − f_i.

For any n > 1, Δf_1n = f_n − f₁ represents the cumulative change between t₁ and t_n, and it follows that as n increases, both the time interval Δt = t_n − t₁ and the magnitude of the observed change Δf_1n grow, suggesting a correlation between the passage of time and the degree of cumulative change. This experiment aligns with Aristotle’s view (circa 320BC) that time is a measure of change and Rovelli’s notion [3] that time emerges relationally between events. Time is thus interpreted as a dimension representing sequential change, where causally linked events (f₁ leading to f₂, then f₃, …) unfold in order.

• 2.1.2. Building on this, consider the quantum superposition principle, where a system exists in multiple states simultaneously. This superposition can be seen as alternate, parallel evolutions of a particle, coexisting along independent temporal pathways. Thus, superposition reflects parallel change, where different potential outcomes unfold concurrently along distinct temporal pathways. Instead of representing probabilistic ambiguity in a single path, superposition can be viewed as representing multiple, parallel evolutions of a system.

Imagine a series of parallel snapshots at a specific moment, f_i, each representing a distinct potential outcome (s_a, or s_b, or s_c …), that coexist simultaneously. This set constitutes a superposition of states at f_i, offering a fresh perspective on quantum superposition. Mathematically, this requires an additional time-like dimension s—a possibility dimension—orthogonal to f, representing parallel change. Each outcome f_1i is then a function of both s and f, i.e., f_1i = s(f₁,s_i). This additional dimension aligns with the many-worlds interpretation (MWI), which holds that all possible states coexist in parallel. The set {s_i} represents the possible outcomes within this parallel dimension.

• 2.1.3. Thus, time can be reconceptualized as a two-dimensional plane of change, (f,s) wherein all outcomes of every event, s(f₁,s_i), coexist within the possibility dimension s, and evolve concurrently in the sequential time dimension f. This dual-dimensional model provides a novel mathematical framework for QM, providing insights into the interplay between determinism and superposition. The proposed model can be expressed as a tensor product space:

  H = H_f ⊗ H_s

  (1)

  where H_f represents the Hilbert space of states evolving in sequential time f, and H_s represents the Hilbert space of states evolving in parallel time s. The tensor product structure, Equation (1), signifies that sequential and parallel evolutions are interwoven within a temporal plane, rather than being independent in two isolated time dimensions. The state of the universe at any moment is described by a vector |Ψ(f,s)⟩, allowing for a rigorous mathematical treatment of both sequential and parallel evolution.

We define sidetime as a physically real dimension of time, encoding parallel quantum outcomes, that is orthogonal to normal time, or foretime, which governs sequential causality. Sidetime enables multiple outcomes to coexist and produce interference—which manifests as superpositions in foretime, aligning with observable phenomena without violating causality. This framework yields the same measurable results as traditional QM, but resolves ambiguities in superposition and the complexities of MWI, offering a clearer, more consistent description of quantum phenomena.

• 2.1.4. Many perplexing anomalies in QM, such as wave–particle duality and the vacuum catastrophe, may stem from the standard assumption that time is inherently one-dimensional. Notably, Itzhak Bars’ two-time physics introduces an extra temporal dimension to unify forces, and Stephen Hawking’s imaginary time [4] avoids singularities. Wheeler assumes many realities, each with its own time [5]. Yet, all adhere to traditional notions of a sequential, clock-based, time progression.

• 2.1.5. In the Copenhagen interpretation, superposition is seen as probabilistic and collapses upon measurement to yield one outcome. In contrast, MWI [6] posits that all outcomes occur in separate universes. This new framework introduces a unified model where all potential outcomes coexist within a five-dimensional reality, integrating both perspectives. This model introduces a time-like possibility dimension (s) as a novel paradigm in our understanding of QM. This additional dimension can be rigorously defined within a five-dimensional manifold M₅:

  M₅ = ℝ³ × f × s

  (2)

  where ℝ³ represents the three spatial dimensions, f is conventional time, and s is a time-like possibility dimension orthogonal to f. This allows for all potential quantum states to coexist in a unified structure, accommodating both probabilistic outcomes and multiplicity without requiring separate universes or collapse mechanisms. Strip Theory is grounded in a five-dimensional framework, encompassing three spatial dimensions and two temporal dimensions—foretime and sidetime. While this framework is sufficient to address key quantum phenomena, it remains open to the possibility of additional dimensions beyond those proposed.

• 2.1.6. In this framework, each possible outcome of every event exists concurrently in sidetime, integrated with the boundless spatial dimensions. Sidetime thus forms a complete, unbounded entity for the entire universe at every moment of foretime. If sidetime encompasses all potential outcomes as a complete whole, then foretime must also be unbounded and fully extant. This conception implies that every moment in foretime forms part of a larger temporal structure coexisting with infinite parallel possibilities. This has philosophical implications, particularly for the grandfather paradox [7] and free will [8].

For example, in the grandfather paradox, any attempt to alter one’s history would result in many alternate outcomes existing in parallel. In several of which the attempt will fail, preserving one’s existence and thereby preventing any actual change to personal history. Regarding free will, while all possible futures exist in sidetime, this model allows for free will by letting conscious choices determine which outcome in sidetime is realised sequentially. Thus, free will remains intact as our choices navigate pre-existing possibilities. This two-dimensional temporal model addresses both philosophical challenges and provides a foundation for further exploration of QM’s nature.

2.2. Two-Dimensional Time

• 2.2.1.If time is indeed a two-dimensional plane of change, equations involving time must be adapted accordingly. In a general four-dimensional equation: F(t,x,y,z), we can formally expand the one-dimensional temporal component t, into two orthogonal dimensions: foretime (f), representing the sequential component of time, and sidetime (s), representing the parallel component. This yields the following:

  F(t,x,y,z) → F(f,s,x,y,z)

  (3)

The extended function now operates in five dimensions instead of four.

• 2.2.2. In classical physics and relativity, the deterministic nature of events precludes the necessity of considering multiple simultaneous outcomes, rendering sidetime irrelevant. Consequently, there is no need to modify these frameworks to accommodate an additional temporal dimension. In contrast, QM involves the superposition of states—a concept that aligns well with sidetime. Therefore, it is logical to reformulate QM within a framework that incorporates both sidetime and foretime. However, QM has been extensively tested and consistently validated, which suggests that sidetime may already be implicitly incorporated within the existing framework.

2.3. Complex Numbers

• 2.3.1. Complex numbers are fundamental to the mathematical formulation of QM [9], yet the reason for their necessity remains elusive—an issue that even troubled Schrödinger. In his correspondence with Lorentz on 6 June 1926, Schrödinger expressed discomfort with complex numbers, believing that the wave function should represent a physically real entity, which led him to question their necessity.

• 2.3.2. Despite these challenges, QM relies on complex numbers to describe and predict the behaviours of quantum systems. The wave function, denoted as ψ(x,t), is typically a complex-valued function. This complex nature is not arbitrary; it allows the wave function to encode both amplitude and phase, both crucial for interference and superposition. Thus, the complex formalism is not merely a convenient tool, but a necessary aspect of how QM models the world. The question that arises is this: why is this necessity so profound?

• 2.3.3. Complex numbers also introduce a crucial dimensionality aspect. In a complex Hilbert space, complex numbers are one-dimensional (dim_ℂ(ℂ) = 1). However, in a real numbered Hilbert space, they require two dimensions (dim_ℝ(ℂ) = 2). This dimensional discrepancy raises important questions about how we interpret QM. Typically, QM is expressed in a four-dimensional complex Hilbert space. However, reinterpreting QM within a real Hilbert space implies an intrinsic five-dimensional framework to account for the full representation of complex numbers.

• 2.3.4. To explore the implications of time as a two-dimensional entity, I treat time as a complex plane. In this framework, foretime corresponds to the real axis, while sidetime is represented on the imaginary axis. However, sidetime is not literally imaginary; it is a physically real dimension that is represented by complex numbers. This representation integrates both sequential and parallel time components within a unified structure.

• 2.3.5. A two-dimensional temporal coordinate (f,is) can be represented as (f + is) transforming the general function (3) as follows:

  F(t,x,y,z) → F(f,s,x,y,z) → F((f + is),x,y,z)

  (4)

This transformation still introduces a parallel time component into the general equation, suggesting a five-dimensional structure, but appears to be four-dimensional. Although QM equations may be four-dimensional when expressed in a complex Hilbert space, this inclusion of sidetime hints at a five-dimensional reality. For example:

Take a basis state: ψ = e^ipx/ℏ

Simplify with p = ℏ: ψ = e^ix

From Euler: ψ = cos(x)+isin(x)

This decomposition reveals the structure of the temporal plane, where cos(x) and isin(x) represent coordinates, which implicitly suggests an additional dimension. Using Euler’s formula within a complex Hilbert space allows inherently five-dimensional QM functions to be expressed in a seemingly four-dimensional form. Reinterpreting cos(x) + isin(x) as the coordinate (cos(x),sin(x)) on the temporal plane suggests that the wave function may contain information about this unrecognised time dimension. A parallel time dimension may not be explicitly recognised in traditional formulations, but it seems to play a crucial role in the underlying structure of QM.

• 2.3.6. Erwin Schrödinger faced significant difficulties formulating his wave equation within a four-dimensional framework and adopted complex numbers to fully capture the quantum behaviour of particles—effectively introducing an implicit fifth dimension. The mathematical construct of a complex Hilbert space maintains the theory’s apparent four-dimensionality but obscures the true dimensionality of QM.

• 2.3.7. A more suitable approach is to continue using two-dimensional complex numbers to represent the phase and amplitude, but do so within a real, five-dimensional Hilbert space—where the extra dimension gives the Schrödinger equation additional dimensionality to fully express quantum behaviours. Since QM implicitly operates in a five-dimensional framework anyway, Strip Theory simply makes this dimensionality explicit and, using a complex representation of time, it preserves QM’s structure without fundamental changes.

The extra dimension is also essential for expressing the probabilistic nature of Schrödinger’s equation. Sidetime, as introduced in Strip Theory, thus becomes indispensable for capturing the complex and probabilistic components inherent to quantum mechanics. The phase aspect is governed by foretime, while the probabilistic nature of quantum mechanics is encoded in sidetime. This five-dimensional framework is not an arbitrary extension; it formalises an inherent aspect of QM that has always been implicitly present, recognising the true dimensional structure underlying QM’s mathematical and conceptual foundations.

• 2.3.8. The invisibility of temporal dimensions to human perception stems from our sensory limitations. Human perception is limited to three spatial dimensions in a continuously evolving present, while the universe operates in at least five dimensions. This dimensional discrepancy, referred to as dimensional 3-5 duality, highlights the need to rethink our approach to interpreting QM.

3. Strip Theory: A Five-Dimensional Framework

This section introduces the fundamental principles of Strip Theory, a novel theoretical framework proposing a five-dimensional model to elucidate quantum phenomena.

3.1. Postulates

• Postulate 1: Time, T, is conceptualised as a two-dimensional manifold T = (f,s), where foretime (f), is the sequential component of time, aligning with the traditional, linear concept of time progression, and sidetime (s), is an orthogonal possibility dimension that represents parallel potential outcomes existing concurrently, supporting quantum superposition. These dimensions combine with the spatial dimensions, to form a five-dimensional manifold for local events, referred to as a strip:s = (x,f,s), that encompasses all possible histories of an event. The totality of all events and their evolution over all time is termed the universal strip
• Postulate 2: All possible histories of an event coexist within a strip. In sidetime, all possible outcomes that can occur are realised. However, observers, who exist in a dimensional 3-5 duality, traverse foretime (f) and perceive only a single history, while their potential actions and outcomes, invisible to the observer, unfold across sidetime (s). Thus, while only one timeline is observed, other possible histories continue to exist within sidetime.

3.2. The Schrödinger Equation

• 3.2.1. The interaction between f and s is analysed here using a dimensionally extended Schrödinger equation:

  iℏ(∂Ψ(x,f,s))/∂f = ĤΨ(x,f,s)

  (5)

  where the Hamiltonian operator Ĥ governs the evolution of the system and the state vector Ψ, is dependent on both f and s. Strip Theory extends the Schrödinger equation to incorporate sidetime dynamically, forming a two-dimensional temporal manifold that allows potential outcomes to be considered as real, rather than nebulous superpositions. However, this extension does not alter the fundamental equations used in quantum mechanics. Upon measurement, sidetime effectively becomes “frozen” for an observer, becoming a non-zero constant. This allows the wavefunction to be factorised into the product of two functions:

  Ψ(x,f,s) = Ψ(x,f) ξ(s).

  (6)

  where ξ is a function of sidetime alone. Substituting this into the extended equation yields the following:

  iℏ(∂(Ψ(x,f)⋅ξ(s))/∂f = Ĥ(Ψ(x,f)⋅ξ(s))

  (7)

Since ξ is a constant independent from f it can be factored out, yielding the following:

iℏ((∂Ψ(x,f))/∂f)⋅ξ(s) = ĤΨ(x,f)⋅ξ(s)

(8)

As ξ(s) is a non-zero constant, we can divide both sides by ξ(s), leading to the following:

iℏ(∂Ψ(x,f))/∂f = ĤΨ(x,f)

(9)

In this way, the extended five-dimensional framework naturally reverts to traditional three-dimensional quantum mechanics in the absence of sidetime dynamics that occurs upon observation. The extended equation is deployed in the five-dimensional universe, and the standard equation is used in the three-dimensional observed universe.

• 3.2.2. The five-dimensional framework proposed in Strip Theory introduces sidetime as an intrinsic temporal dimension. This is expressed through the extended Schrödinger equation: iℏ(∂Ψ(x,f,s))/∂f = ĤΨ(x,f,s). As demonstrated in Equations (5)–(9), the wavefunction factorisation Ψ(x,f,s) = Ψ(x,f)⋅ξ(s) shows that sidetime cannot be zero because it governs the distribution of quantum possibilities.

The five-dimensional framework extends the Schrödinger equation by incorporating sidetime dynamics. The wavefunction factorises as Ψ(x,f,s) = Ψ(x,f)⋅ξ(s), where ξ(s) is a function of sidetime. This factorisation highlights that sidetime cannot be zero, as it encodes the distribution of quantum possibilities. Upon observation, sidetime effectively becomes a constant for the observer, allowing the equation to naturally reduce to the standard three-dimensional quantum mechanics formalism. This ensures compatibility with established quantum principles while introducing a structured framework for coherence and superposition phenomena.

• 3.2.3. This extension of the Schrödinger equation provides a specific model tailored to quantum mechanics, wherein sidetime governs potential quantum outcomes without altering the core principles of QM. Approaches like Bars’ Two-Time Physics framework and other multidimensional models explore additional time dimensions but are generally grounded in symmetry-based or relativistic settings. Strip Theory, by contrast, focuses on non-relativistic quantum mechanics, specifically addressing quantum coherence, interference, and wavefunction behaviour through a five-dimensional framework.

3.3. Quantum Clones

• 3.3.1. In accordance with postulate 2, all possible histories of an event are real, exist in sidetime (s) and evolve in foretime (f), represented by a wavefunction Ψ(x,f,s). Each individual history is denoted as a clone, φ_j, with all such clones equally real and unprivileged. A quantum clone is a distinct instantiation of a particle within sidetime, representing a unique eigenstate or possible outcome of a quantum event. Collectively, these clones form a five-dimensional wavicle—a cloud-like structure encompassing all possible quantum states of a particle. The term particle may loosely refer to either wavicle or clone, depending on context.

• 3.3.2. When a particle is created, the associated wavicle consists of a superposition, or a cloud, of quantum clones. I introduce the term “cloud” to emphasize the ontological reality of quantum states, in contrast to the conventional interpretation of superposition, which is often viewed as a purely mathematical construct. This term represents all potential outcomes of the event:

  $$\Psi (x,f,s)=\underset{j}{\Sigma }{c}_j{\phi }_j(x,f)$$

  (10)

  where φ_j(x,f) is the state of the jth clone, and c_j are the probability amplitudes of these states. The wavicle evolves in foretime as a wave packet, while each clone propagates along its unique path, or timeline, in sidetime. Upon measurement, a single clone is observed, manifesting as the entire particle from the observer’s limited three-dimensional perspective.

• 3.3.3. Clones exist within a wavicle in the same three-dimensional space, and their behaviour resembles multiplexing, where multiple signals are modulated onto a single carrier wave. The wavicle’s wavefunction serves as the carrier wave, encoding all potential quantum states. Each clone corresponds to a modulated signal, representing a single eigenstate. During measurement, the process selects a single clone—or a coherent combination of clones—with dimensional reduction producing the observed state.

• 3.3.4. Clones within a discrete wavicle can overlap and produce interference owing to their intrinsic identity as quantum manifestations of the same particle. It occurs because the clones represent different quantum states of a single underlying entity, forming a coherent superposition. In contrast, the clones of distinct particles, described by independent wavefunctions, do not interfere with each other.

For example, two distinct electrons will experience electrostatic repulsion, preventing significant wavefunction overlap, and they do not form a coherent superposition. Conversely, in a single-particle double-slit experiment, a single electron’s wavefunction coherently splits into clones along different paths, resulting in path superposition. Upon recombination, this superposition produces the interference pattern due to the overlap of the wavefunction’s own quantum states across paths. This dual nature arises naturally from the clonal structure of wavicles, resolving the wave–particle duality by unifying both behaviours within the same framework.

• 3.3.5. Upon measurement, any permissible eigenstate of a particle can be observed. All possible outcomes of a quantum measurement must be accounted for, so a wavicle contains distinct clones corresponding to every possible outcome of the wavefunction. Each clone represents a unique eigenstate configuration, encapsulating all possible measurement outcomes within the structure of the wavicle.

• 3.3.6. The clonal interpretation of quantum mechanics suggests that phenomena like quantum tunnelling and entanglement arise from sidetime dynamics. For example: With Quantum tunnelling, clonal interference can amplify energy momentarily, allowing a clone to overcome classically forbidden barriers. Also, with entanglement clonal ensembles across sidetime naturally preserve coherence, explaining non-local correlations without faster-than-light communication. By framing quantum phenomena in terms of clones and wavicles, Strip Theory provides a coherent and intuitive explanation for superposition, interference, and measurement, integrating these behaviours into a unified five-dimensional model.

3.4. Wave–Particle Duality

• 3.4.1. Wave–particle duality, a central concept in quantum mechanics, describes how particles like photons and electrons exhibit both wave-like and particle-like behaviour [9]. In Strip Theory, this duality is explained through the wavicle, a structure comprising a cloud of clones—distinct instances of the same quantum entity. Upon measurement, a dimensional reduction occurs, reducing the five-dimensional state to three dimensions, which isolates a specific clone φ_j and manifests particle-like properties. Conversely, the wave-like nature arises from the collective behaviour and interference of all clones within the wavicle’s sidetime structure.

• 3.4.2. In Strip Theory, wave–particle duality naturally emerges from the clonal structure of wavicles. The particle-like behaviour corresponds to the detection of individual clones φ_j, while the wave-like behaviour arises from the collective, superpositional properties of the entire cloud of clones distributed across sidetime. This framework resolves the duality by suggesting that both wave and particle properties are intrinsic to the system. For example, in the photoelectric effect, the experimental setup isolates specific clones, demonstrating particle-like behaviour. In the double-slit experiment, however, the wave-like features of the entire wavicle emerge, reflecting the coherence across clones.

• 3.4.3. In Strip Theory, quantization occurs within the individual clones of a wavicle, rather than at the particle level. Each clone, as a discrete quantum instance, inherits quantized attributes such as energy levels, representing possible eigenstates of the particle’s wavefunction. This reframes quantization as a property of the collective clone ensemble within sidetime, rather than an isolated particle. This perspective naturally explains phenomena like interference and quantum tunnelling, where superpositional interactions among quantized clones give rise to observed effects. The quantized energy states of a wavicle, governed by sidetime dynamics, naturally align with traditional particle-level quantization in scenarios where sidetime’s influence is indistinguishable from standard quantum mechanics predictions.

3.5. Timelines

• 3.5.1. A strip exists within the 5-brane: the full five-dimensional structure in Strip Theory, encompassing space, foretime, and sidetime, where all quantum outcomes coexist and interact continuously. Observations take place in the 3-brane: the three-dimensional space we experience, composed of three spatial dimensions that change over foretime, presenting classical outcomes as our perceived reality.

• 3.5.2. A timeline is defined as the trajectory of an individual clone (or observer) through a 5-brane strip. Each quantum clone φ_j evolves along its own distinct timeline τ_j, represented as a path within the 5-brane. The state of each clone at any given moment is expressed by the quantum state vector |φ_j(f,s)⟩. Each timeline τ_j corresponds to a unique realisation of the particle’s evolution through the five-dimensional strip s = (x,f_,s). These timelines evolve according to the extended Schrödinger equation, where |φ_j(f,s)⟩ depends on both temporal dimensions, enhancing the potential for continuous coherence across outcomes.

• 3.5.3. Interference phenomena occur when two or more clones, φ_j, φ_k, … progressing along different timelines t_j, t_k, … intersect at shared coordinates in (x,f). At such intersections, quantum states can superpose, yielding a total wavefunction for the intersecting clones as follows:

  $${\Psi }_{\mathit{total}}(x,f)=\underset{j}{\Sigma }{c}_j{\phi }_j(x,f,s)$$

  (11)

  where c_j are complex coefficients representing the probability amplitudes of the respective clones. The interference pattern is derived from the following probability distribution:

  $$P(x,f)={|{\Psi }_{\mathit{total}}(x,f)|}^2={|\underset{j}{\Sigma }{c}_j{\phi }_j(x,f,s)|}^2$$

  (12)

  where constructive or destructive interference occurs based on phase alignment between overlapping clones—mirroring the principles underlying Feynman’s path integral formulation in standard quantum mechanics.

• 3.5.4. A timeline (τ_j) encapsulates a clone’s (or an observer’s) individual history as it unfolds across both temporal dimensions. In Strip Theory, timelines bear analogy to the multiple universes of MWI but differ fundamentally by preserving coherence within sidetime, rather than creating isolation. Consequently, each timeline represents a distinct, consistent historical trajectory from the perspective of the observer or clone within the continuous sidetime structure, aligning quantum potentialities with classical outcomes.

3.6. Vacuum Catastrophe

• 3.6.1. The vacuum catastrophe, which refers to the vast discrepancy between the predicted and observed vacuum energy density, arises in Quantum Field Theory (QFT) when integrating over all quantum field fluctuations. QFT predicts that the zero-point energies of these fluctuations contribute to the cosmological constant Λ but results in theoretical values that exceed observed values by 120 orders of magnitude.

• 3.6.2. In Strip Theory, sidetime provides an alternate perspective on this summation process. Each quantum fluctuation—corresponding to a possible vacuum state or timeline—is treated not as an isolated event but as part of a continuous sidetime manifold. Within sidetime, all possible states coexist in parallel, forming a dense, unobservable ‘cloud’ of timelines. Thus, the standard QFT summation can be interpreted as integrating over not just a single timeline but across the entire sidetime continuum, implicitly including the energy contributions of every possible vacuum fluctuation across sidetime.

• 3.6.3. Mathematically, this interpretation suggests that the calculated vacuum energy e_calculated accounts for an extensive sidetime structure, leading to an accumulation of energy contributions that are far larger than the energy observed within any single timeline. The observed energy e_observed, in contrast, represents the zero-point energy specific to an observer’s single timeline and does not encompass the additional energy from unobserved timelines within sidetime.

• 3.6.4. The measurement of zero-point energy within a vacuum yields a value specific to the vacuum as it exists within the observer’s singular timeline t_j. In contrast, when QFT equations—within the context of the 5-brane framework—are used to calculate vacuum energy, these calculations take into account contributions from all possible timelines. Hence, the energy value (e) is dependent on the framework used:

    Observed: e = e_j  for one j
    Calculated:  e = Σ e_j for all j

  This discrepancy between single-timeline observations and multi-timeline calculations explains the massive difference—up to 120 orders of magnitude—between the predicted and observed vacuum energies.

• 3.6.5. To quantify this huge difference, Strip Theory introduces the sidetime ratio S_r, defined as the ratio between the calculated vacuum energy across all timelines and the observed vacuum energy in a single timeline:

  S_r = e_calculated/e_observed ≈ 10¹²⁰

  (13)

  This ratio, S_r, representing the calculated energy across all sidetime timelines relative to a single timeline, offers a potential resolution to this longstanding problem, aligning the theoretical predictions with observed values. As a comparison, the total number of water molecules on earth is ≈10⁵³.

• 3.6.6. Additionally, this ratio provides an approximate upper bound on the number of parallel timelines that a given particle or quantum state can occupy, with each clone existing in a distinct yet concurrent timeline. Since the clonal timelines of each particle are concurrent with those of other particles, this also suggests the existence of approximately S_r parallel timelines. Although vast, this number represents a reasonable upper bound on the potential “size” of sidetime, encapsulating the extent of possibilities in this additional temporal dimension.

3.7. Forces of Nature

• 3.7.1. In classical physics, forces like gravity, electromagnetism, and the strong and weak nuclear forces operate within well-defined spatial and temporal boundaries. Strip Theory introduces a five-dimensional framework, encompassing sidetime and foretime, which raises questions about how these forces extend across these dimensions.

• 3.7.2. In Strip Theory, forces are constrained to act within the present moment of a specific timeline. This constraint preserves causality and prevents inconsistencies with observed phenomena. If forces like gravity or electromagnetism operated across sidetime or non-sequentially through foretime, non-local interactions would disrupt the balance of energy and momentum within a timeline. For example, an electron with a rest mass of 9.11 × 10⁻³¹ kg 9.11 × 10⁻³¹ could have up to 10¹²⁰ clones, yielding a total mass of approximately 10⁹⁰ kg. If gravity acted across sidetime, this mass accumulation would collapse the electron into a black hole. Similarly, forces like electromagnetism, which are finely tuned to interact at specific scales, would introduce catastrophic instabilities if extended across timelines.

• 3.7.3. To preserve physical consistency, Strip Theory posits that the influence of gravity, electromagnetism, and nuclear forces act within individual timelines and do not propagate through sidetime or across foretime. These forces operate sequentially within foretime and remain spatially localised within the present moment of a timeline, ensuring that cause precedes effect and causality is maintained. This localisation aligns with observational evidence and avoids contradictions inherent in extending forces across dimensions beyond the four dimensions of classical physics.

• 3.7.4. By constraining the operation of forces to individual timelines Strip Theory integrates seamlessly with classical observations of force interactions, such as gravitational attraction or electromagnetic fields. The framework avoids introducing inconsistencies with experimental results while allowing sidetime to influence quantum phenomena independently of classical forces.

3.8. Nonlocality

• 3.8.1. The Einstein–Podolsky–Rosen (EPR) [10] paradox was devised to demonstrate that QM might be incomplete. In the Bohm version of the EPR experiment, a spin −1/2 particle pair is prepared in a singlet state, which decays into two spatially separated, entangled particles, A and B, with opposite spins +1/2 (↑) and −1/2 (↓). If the spin of particle A is measured and found to be ↑, then particle B’s spin must necessarily be ↓ to preserve the total spin of the system. This instant determination of B’s spin upon the measurement of A’s spin implies that information about A’s measurement outcome is transmitted to B faster than the speed of light, which violates the principle of locality.

• 3.8.2. In Strip Theory, this nonlocality is treated differently. Particles A and B are interpreted as ensembles of entangled clones, each with defined spin states in parallel timelines. Consider two such entangled pairs, (A↑,B↓) in timeline t₁ and (A↓,B↑) in timeline t₂. Upon measurement, the observer chooses timeline t₁ or t₂, but the spin states are embedded in the system, so no information instantly propagates between particles. Measurement reveals the spin configuration embedded in the intersected timeline, preserving locality within the universal 5-brane framework—without spooky action at a distance. Non-locality only appears in the observer’s limited 3-brane framework.

3.9. Time

In QM, time is treated as a fixed, universal parameter that flows uniformly across spacetime. In contrast, GR treats time within a spacetime geometry that varies based on the observer’s frame of reference and the local curvature caused by mass/energy. Strip Theory proposes a unified framework by integrating these two seemingly incompatible perspectives. Time possesses both absolute and relative aspects depending on whether we consider the higher-dimensional 5-brane or the lower-dimensional 3-brane. In the 5-brane structure, time is universal and fully extant; i.e., all time exists at once in a kind of “simultaneous now”, where past, present, and future are all equally real. Conversely, in the 3-brane framework, time is a relative phenomenon that emerges from the observer’s movement along a specific timeline. Effects like time dilation are shaped by the curvature of spacetime, in accordance with general relativity, and is perceived differently by observers depending on their motion and gravitational environment.

3.10. Decoherence

• 3.10.1. In conventional quantum mechanics, decoherence explains how classicality emerges from quantum superpositions. Through environmental entanglement, a system’s coherence decays, leading to a reduced density matrix for the system, defined as ρS = TrE(ρSE) where ρSE = ρS ⊗ ρE represents the combined system–environment state. This tracing-out process removes coherence between the system and environment by suppressing off-diagonal elements of ρS, which represent coherence between superposed states. Decoherence aligns the system into a “preferred basis” corresponding to classical outcomes, a critical feature in interpretations like MWI, where each branch forms a distinct classical “world” without interference between different outcomes.

• 3.10.2. Strip Theory diverges from this standard view by introducing sidetime, an additional temporal dimension where all potential quantum outcomes are continuously defined as part of a five-dimensional wavefunction, Ψ(x,f,s), where foretime (f) governs sequential events along observable timelines and sidetime (s) encodes parallel outcomes, representing a continuum of coexisting possibilities. Unlike traditional decoherence, where coherence decays through environmental entanglement, Strip Theory posits that sidetime continuity inherently preserves coherence because it represents a continuous, self-contained dimension where all quantum states remain dynamically coupled. This eliminates the need for external interactions, as coherence is maintained within the intrinsic dynamics of sidetime due to the seamless coupling of quantum states across the continuous sidetime manifold.

• 3.10.3. In this framework, sidetime acts as a unifying field, linking clones—the quantum manifestations of a particle—into a cohesive wavefunction. Coherence naturally emerges from continuous interactions among clones, akin to the flow of currents in a stream. Each clone influences the next, maintaining quantum information and phase relationships throughout sidetime. This internal coupling ensures that coherence is preserved without requiring external environmental factors. Coherence in sidetime is preserved through smooth wavefunction evolution, with no interaction with external systems and governed by ∂Ψ(x,f,s)/∂s = −iĤ_sΨ(x,f,s), where Ĥ_s governs sidetime evolution by encapsulating phase continuity across states. Phase divergence, described by Δϕ(s), accounts for coherence reduction between sidetime currents, leading to classicality as divergence increases.

• 3.10.4. While sidetime continuity supports coherence, certain pathways within sidetime may gradually diverge in phase. This divergence reduces coherence across specific currents, leading to the emergence of distinct classical outcomes. As some pathways in sidetime become more pronounced, the system evolves towards a stable quantum state that aligns with observed classical phenomena. This process seamlessly transitions quantum possibilities into classical realities without invoking traditional decoherence.

• 3.10.5. The observer’s interaction with sidetime is an active process, with free will playing a critical role in selecting a specific outcome. Within the sidetime framework, free will serves as the mechanism by which an observer navigates the continuum of coexisting possibilities, reducing the five-dimensional wavefunction Ψ(x,f,s) to a three-dimensional classical outcome. This selection aligns the observer’s foretime trajectory with a chosen sidetime pathway, producing a cohesive experience.

This process is intrinsically tied to the sensory apparatus, which acts as a conduit for dimensional reduction. By interacting with sidetime currents, the sensory system narrows the observer’s engagement with the five-dimensional structure into a single timeline, creating the illusion of classicality and integrating sensory input with the quantum state to collapse multiple pathways into a coherent foretime-aligned experience.

• 3.10.6. While decoherence in traditional quantum mechanics explains the suppression of interference between branches, it does not address the emergence of a single observed outcome. Strip Theory reinterprets this process as a dimensional reduction, where the projection from the 5-brane to the 3-brane inherently selects a specific outcome without relying on decoherence as a mechanism. This framework preserves coherence in sidetime while providing a deterministic explanation for classicality and the observer’s experience of a single timeline. Nonetheless, the empirical predictions of decoherence remain consistent within Strip Theory, ensuring compatibility with experimental observations.

• 3.10.7. For example, Strip Theory provides an alternative framework to decoherence for interpreting the loss of quantum coherence observed in ion trap experiments. Instead of attributing coherence loss to environmental entanglement and the suppression of off-diagonal terms in the density matrix, Strip Theory posits that coherence arises from the alignment of quantum clones within sidetime. Environmental perturbations disrupt this alignment, introducing phase divergence among sidetime pathways and rendering interference effects unobservable in the 3-brane. This framework aligns with experimental observations, such as the loss of interference patterns under environmental coupling, while avoiding the need for a quantum–classical boundary and offering a deterministic, higher-dimensional perspective on coherence dynamics.

• 3.10.8. Strip Theory predicts that sidetime dynamics may produce detectable deviations from traditional decoherence. For instance, interference patterns may persist in systems with minimal environmental coupling, such as in ultra-cold or high-vacuum conditions. Observing such residual coherence, distinguishable from standard environmental effects, could indicate sidetime’s role in sustaining quantum states beyond conventional decoherence predictions.

3.11. Multiple Locations

• 3.11.1. In conventional QM, the state of a particle is described by a wavefunction ψ(x,t), representing the probability amplitude of finding the particle at position x at time t. A non-zero probability amplitude at multiple locations is often seen as the particle existing simultaneously in different positions––or teleporting between them, challenging classical notions of locality and realism. Strip Theory reinterprets the wavefunction as a cloud of clones propagating across timelines in sidetime. In this view, a “particle” does not exist in multiple locations simultaneously but is instead represented by its clones, each occupying a unique position along parallel sidetime trajectories. The probability amplitude at a given location reflects contributions from clones already present at that position in their respective timelines.

• 3.11.2. This clonal framework resolves apparent violations of locality. For example, a particle observed at two locations within a short time interval is understood as the observation of two different clones. Apparent teleportation does not involve a single particle traversing space instantaneously but arises from clones already distributed across space via sidetime propagation. Strip Theory redefines the concept of multiple locations as an emergent property of sidetime dynamics. This reinterpretation preserves locality while aligning with experimental observations, offering a coherent alternative to classical interpretations of quantum mechanics.

3.12. Quantum Tunnelling

• 3.12.1. Quantum tunnelling, where particles penetrate classically forbidden barriers, is traditionally explained by a wavefunction’s non-zero amplitude beyond the barrier. Strip Theory offers an alternative mechanism, attributing tunnelling to interference between clones within sidetime. Clones propagate along separate timelines but may intersect in foretime, where constructive interference temporarily amplifies the clone’s energy, enabling it to overcome the barrier.

• 3.12.2. Whilst this amplification is governed by the uncertainty principle (ΔTΔE ≥ ℏ/2), the energy is framed as borrowed from sidetime—rather than the uncertainty principle itself. Total energy conservation is maintained across sidetime, with amplification in one timeline offset by reductions in others. As clones move past their intersection, interference dissipates and, effectively, returns the energy.

3.13. Uncertainty

• 3.13.1. Heisenberg’s uncertainty principle asserts that it is fundamentally impossible to precisely determine both the position and momentum of a particle at the same time. This limitation arises from the fundamental properties of quantum mechanics, where the position and momentum operators do not commute. This non-commutativity mathematically constrains the precision of simultaneous measurements, leading to the well-known uncertainty relation, where the product of position uncertainty and momentum uncertainty must exceed a minimum value proportional to Planck’s constant.

• 3.13.2. Strip Theory offers a reinterpretation of the uncertainty principle by positing that particles are not singular entities but rather clouds of quantum clones distributed across sidetime. Measuring a particle’s position corresponds to observing the position of a specific clone within a given timeline. Conversely, measuring momentum reflects the momentum of another clone, which may occupy a different position in sidetime. Since these measurements do not necessarily pertain to the same clone, the observed uncertainty arises naturally within this multidimensional framework.

• 3.13.3. The uncertainty principle, through the lens of Strip Theory, emerges from the extensive clonal distribution across sidetime. This distribution can be described by a density function, ρ_clone(s), representing the spatial and momentum probabilities of clones within sidetime. For a particle with N∼10¹²⁰ clones, the likelihood that both position and momentum measurements correspond to the same clone is approximately proportional to 1/N. The large number of clones imposes a practical limit on the precision of simultaneous measurements. Even in an ideal scenario, this stochastic sampling of clones across sidetime ensures that position and momentum measurements are inherently probabilistic in the observer’s 3-brane, reflecting the principle of uncertainty as a natural consequence of clonal dispersion.

• 3.13.4. The uncertainty principle in Strip Theory arises naturally from the stochastic sampling of quantum clones in sidetime, which differs from existing approaches in higher-dimensional theories. Some multidimensional frameworks propose generalised uncertainty relations tied to gauge symmetries or compactified time dimensions, such as Generalized Uncertainty Principle and Extra Dimensions [11], which discusses modifications to standard quantum mechanics due to Planck scale effects and explores extending these modifications to higher-dimensional spacetimes. Also, DaeKil Park’s Generalized Uncertainty Principle and DDD-Dimensional Quantum Mechanics [12], examines non-relativistic quantum mechanics with a generalised uncertainty principle in DDD-dimensional free particle and harmonic oscillator systems, deriving Feynman propagators within the first order of the GUP parameter.

• 3.13.5. In contrast, Strip Theory models this uncertainty through clonal dispersion across sidetime, offering a framework where probabilistic measurement outcomes emerge naturally from the observer’s limited interaction with a multidimensional quantum system.

• 3.13.6. While the uncertainty principle suggests probabilistic outcomes, Strip Theory differentiates between the observer’s 3-brane perspective and the deterministic framework of the 5-brane. In the 5-brane, all quantum clones possess fixed values for position and momentum, satisfying conservation laws, but observers in the 3-brane interact with a single clone per measurement, leading to the apparent randomness of quantum outcomes. The uncertainty principle, therefore, reflects the observer’s limited interaction with sidetime rather than a fundamental indeterminacy in the 5-brane.

• 3.13.7. Strip Theory’s 3-5 duality provides a deeper understanding of the uncertainty principle. In the 3-brane, measurements are constrained by the observer’s interaction with a single timeline, resulting in probabilistic uncertainty. In the 5-brane, encompassing all quantum possibilities deterministically, there is no such uncertainty. Observables are fixed and consistent across sidetime trajectories. The uncertainty principle thus exemplifies the 3-5 duality: it highlights the incomplete nature of observations in the 3-brane, constrained by dimensional reduction, while preserving deterministic reality in the 5-brane. This perspective situates the principle within a broader framework, where uncertainty is not fundamental but a manifestation of the observer’s limited capacity to access the full multidimensional structure of the universe.

3.14. The Measurement Problem

The measurement problem, one of the most debated issues in quantum mechanics, encompasses questions about wavefunction collapse, observation, and the emergence of classicality. Strip Theory addresses these questions by providing a higher-dimensional framework that naturally incorporates sidetime. This framework reinterprets wavefunction collapse as a projection process, offering a deterministic explanation for the observer’s experience of a single, coherent reality.

• 3.14.1. In Strip Theory, wavefunction collapse is not a physical destruction of superposition but a dimensional reduction. The quantum state of a system exists within the 5-brane, where all possible outcomes coexist. When an observer in the 3-brane measures the system, this act reduces the higher-dimensional wavefunction, Ψ(x,t,s), to a lower-dimensional slice, ψ(x,t). This projection shifts the observer’s perspective from the 5-brane’s full reality to a single 3-brane outcome, explaining the apparent collapse.

• 3.14.2. All possible measurement outcomes exist within sidetime as distinct quantum states in the 5-brane. Measurement selects one state corresponding to the observer’s specific timeline in the 3-brane. Crucially, every potential outcome is observed by a distinct clone of the observer in another sidetime timeline. From the 3-brane perspective, the observer perceives only one outcome, but from the 5-brane perspective, all outcomes are realised across parallel timelines.

• 3.14.3. The probabilistic nature of quantum mechanics reflects the observer’s limited 3-brane perspective. Each outcome in sidetime is part of a superposition described by Ψ(x,t,s). During observation, this wavefunction projects onto the 3-brane, giving rise to the observed probability distribution. The Born rule emerges as a statistical reflection of the likelihood that the observer aligns with a particular sidetime timeline.

• 3.14.4. Each act of measurement anchors the observer to a specific sidetime timeline. Subsequent observations unfold coherently along this timeline, constraining future possibilities. Earlier measurements effectively “fix” the trajectory through sidetime, ensuring consistency across all subsequent observations. Unlike the many-worlds interpretation, which suggests branching universes, Strip Theory confines outcomes to coherent timelines within sidetime.

• 3.14.5. Strip Theory posits that human cognition acts as a filter, selecting a single timeline from the 5-brane’s multidimensional reality. Neurological and sensory mechanisms reduce the 5-brane structure into a simplified, three-dimensional experience. This “reality bubble” creates a deterministic and consistent perception despite being derived from a probabilistic, higher-dimensional framework. Much like tuning a radio to a specific frequency, the brain aligns with one timeline, yielding the experience of a single, coherent reality.

4. Sidetime and Other Frameworks

The introduction of sidetime in Strip Theory presents a profound shift in how temporal evolution is conceptualised in quantum mechanics. Sidetime offers a richer framework for understanding the branching of quantum states and the coexistence of multiple outcomes. This additional temporal dimension reshapes existing frameworks by altering the treatment of time, superposition, and causality within a five-dimensional context, which can extend and improve other interpretations:

4.1. Copenhagen Interpretation

• 4.1.1. In the Copenhagen interpretation certain aspects remain unclear. In von Neumann’s exposition, for example, an isolated quantum system is described by a complex state function, ψ, which evolves according to two distinct processes:
  • Process 1: In a system where c_j = <φ_j|ψ>, with wavefunctions φ_j representing all possible outcomes of measuring ψ—described as a superposition of states—an observation causes a discontinuous change in ψ, reducing it to a particular state φ_j with a probability given by the Born rule: |(ψ, φ_j)|².
  • Process 2: In a deterministic way, ψ evolves according to the Schrödinger equation, (ih/2π)∂ψ/∂t = Hψ where H is the Hamiltonian operator. When measured, a cut occurs and the wavefunction collapses with probability given by process 1.
  where the phrases in italics remain unqualified.

• 4.1.2. Within the Strip Theory framework, Process 2 is interpreted as the unobserved evolution of a five-dimensional strip over foretime. In Process 1, superposition corresponds to the distribution of possible outcomes (clones) across sidetime. Discontinuous change and cut are interpreted as the dimensional reduction that occurs upon measurement, rendering wavefunction collapse as the 3-brane observation of a 5-brane event. Strip Theory thereby provides a more rigorous framework for the Copenhagen interpretation which clarifies previously unqualified properties.

4.2. Pilot Wave Theories

• 4.2.1. In Pilot Wave theories, like the de Broglie–Bohm model [13], particles follow deterministic paths guided by hidden variables. Non-locality in these theories arises due to the hidden variables influencing particle motion even across separated regions. Strip Theory reinterprets this, embedding hidden variables within sidetime, allowing particle paths to evolve deterministically through sidetime without non-local effects (see Section 3.8).

• 4.2.2. Hidden variables are reinterpreted as sidetime parameters, where a particle’s trajectory, γ_j(f,s), evolves deterministically. Here, foretime dictates the progression of observables, while sidetime enables branching and alternative paths. A particle’s position is influenced by a pilot wave evolving through the following coupled dynamics:

  ∂x(f,s)/∂f = v(f,s)

  (14)

  iℏ(∂Ψ(f,s))/∂f = Ĥ_f Ψ(f,s)

  (15)

  iℏ(∂Ψ(f,s))/∂s = Ĥ_s Ψ(f,s)

  (16)

  where v(f,s) is the particle’s velocity, and Ĥ_f and Ĥ_s are Hamiltonians governing wavefunction evolution in foretime and sidetime, respectively. By localising hidden variables within the sidetime dimension, Strip Theory establishes a deterministic, five-dimensional structure where particle and wave interactions unfold coherently without requiring non-local forces. This local, realistic approach preserves Pilot Wave Theory’s conceptual foundation, but attributes hidden variables to sidetime rather than to instantaneous action at a distance, thus integrating determinism and realism within a coherent five-dimensional framework.

4.3. Relational Quantum Mechanics

• 4.3.1. Relational Quantum Mechanics (RQM) [14] posits that quantum states are observer-dependent, meaning they are not absolute but contingent on the information available to a specific observer. The state of a system reflects the relational information between observer and system, allowing different observers to assign different quantum states to the same system based on their individual interactions.

• 4.3.2. Strip Theory aligns with this relational approach, embedding observers in a five-dimensional framework. Each observer’s experience is a three-dimensional projection of this higher-dimensional structure, meaning that their perception of quantum states is inherently relational, based on their unique path through foretime and sidetime. Observers experience the five-dimensional reality from distinct perspectives defined by their positions within a given strip. Consequently, quantum states in Strip Theory evolve relative to the observer’s specific trajectory γ_j(f,s) in five-dimensional space, linking the wavefunction Ψ(f,s) to the observer’s position in foretime and sidetime.

• 4.3.3. Formally, let the quantum state of a system relative to an observer O_j be denoted by |Ψ(t_f,t_s)⟩. This state is a function of both temporal dimensions, reflecting the observer’s unique trajectory through sidetime and foretime. The observer’s experience of quantum events evolves according to the Schrödinger equations, which govern the dynamics in both temporal dimensions:

  iℏ∂/∂t_f |Ψ(t_f,t_s)⟩ = Ĥ_f |Ψ(t_f,t_s)⟩

  iℏ∂/∂t_s |Ψ(t_f,t_s)⟩ = Ĥ_s |Ψ(t_f,t_s)⟩

  Here, Ĥ_f and Ĥ_s are the Hamiltonians for the evolution in foretime and sidetime, respectively, and |Ψ(t_f,t_s)⟩ represents the quantum state as perceived by the observer O_j. This formalism captures the relational nature of QM, where the state is relative to the observer’s position and trajectory within a five-dimensional strip.

• 4.3.4. Strip Theory thus upholds RQM’s principles, embedding the observer’s unique viewpoint within its framework. Quantum states are inherently relational, evolving based on the observer’s path through foretime and sidetime, allowing multiple valid quantum descriptions by different observers according to their distinct positions in the five-dimensional structure.

4.4. Many-Worlds Theories

Everettian Quantum Mechanics (EQM) [15] and the many-worlds interpretation (MWI) posit that all possible outcomes of a quantum measurement occur in distinct, non-interacting branches of reality remaining isolated due to decoherence, which prevents interference between branches. Strip Theory offers an alternative perspective, situating these outcomes within a unified sidetime structure that preserves coherence and interaction across timelines. This distinction is considered in several key areas:

• 4.4.1. Branching: In MWI, quantum states split into isolated branches, creating a separate “world” for each outcome. In Strip Theory, this branching occurs as the evolution of distinct timelines within sidetime, rather than separate universes. Each timeline represents a coherent clonal trajectory within the five-dimensional structure: Ψ(f,s) = ∑c_jφ_j(f,s), where φ_j(f,s) corresponds to a clone’s state, and c_j are probability amplitudes. Timelines in sidetime allow outcomes to coexist while retaining potential for interference, distinguishing Strip Theory from MWI’s strict isolation of branches.

• 4.4.2. Decoherence: In EQM, as outlined by David Wallace [16] and others, explains why observers experience one outcome per measurement, isolating identities along branches and making branching irreversible. However, Adlam [17], among others, explores alternatives to decoherence. Strip Theory offers an alternative by situating outcomes in connected timelines within sidetime (s), achieving classicality through sidetime continuity and dimensional reduction upon observation, rather than decoherence. Sidetime continuity permits natural interference between timelines, as discussed in Section 3.10, making separate decoherence mechanisms unnecessary.

• 4.4.3. Time: EQM suggests that time evolves independently in each branch, prompting debate over whether time is global or relational. This aligns with Hugh Everett’s view of time as branch-dependent. Emily Adlam further examines whether cross-branch interference could indicate an interdependent temporal framework, challenging the conventional “branch-independent” time notion. As discussed in Section 3.9, Strip Theory regards time as universal within the 5-brane but it emerges as relative in the 3-brane.

• 4.4.4. Identity: MWI raises questions about the persistence of identity across branches. Wallace argues that identity remains continuous within a branch but diverges between branches. In Strip Theory, identity is treated as continuous within timelines in sidetime, where an observer’s actions are mirrored by alternate versions along parallel paths. Interactions with others occur through “shared” timelines, but individual choices lead to divergence. Coherence within sidetime ensures a seamless transition to an alternate clone of the departed individual, preserving the continuity of identity. While our identity remains persistent, interactions with others are fractured. This framework avoids the rigid compartmentalisation of identity seen in MWI, offering a more fluid interpretation of observer trajectories.

4.5. QED

• 4.5.1. In QFT, “virtual” particles are central to explaining phenomena such as the Lamb shift, vacuum polarisation, and the Casimir effect. In quantum electrodynamics (QED), they are described as transient entities that mediate interactions by temporarily violating energy conservation, justified by the time–energy uncertainty principle. However, this interpretation raises conceptual challenges, including conflicts with classical expectations of particle trajectories and the physical reality of virtual particles.

• 4.5.2. Strip Theory reinterprets virtual particles as real clones existing in sidetime. These clones interact dynamically within the sidetime framework, remaining imperceptible within the confines of a spacetime-based observational framework. For example, the emission and absorption of virtual photons occur as interactions between photon and electron clones in sidetime. This resolves the paradox of photon trajectories, replacing them with clonal dynamics that conform to classical expectations of straight-line behaviour. An electron clone emits a photonic clone, which propagates linearly in sidetime before interacting with another electron clone. This sidetime interaction manifests as a net electromagnetic effect observed in spacetime.

• 4.5.3. Unlike conventional interpretations, Strip Theory eliminates the need for borrowing energy from the uncertainty principle. Clonal interference within sidetime redistributes energy while maintaining conservation laws. For example, if two clones interfere positively in one timeline, providing enough energy to overcome a barrier, Postulate Two ensures there must be an alternate timeline where the clones interfere negatively, providing no energy. This balanced interference across sidetime preserves overall energy conservation, even as individual timelines exhibit varying outcomes. Effectively, the energy is redistributed within sidetime rather than being “borrowed” from the uncertainty principle.

• 4.5.4. The vacuum, traditionally seen as nearly empty, is reimagined in Strip Theory as a densely populated medium filled with clones. These clones interact through interference patterns, generating zero-point energy and other measurable effects, such as vacuum polarisation and the Casimir effect. This reinterpretation transforms the vacuum into a dynamic structure within sidetime, providing a coherent explanation for its energetic contributions. By treating virtual particles as tangible entities within sidetime, Strip Theory resolves ambiguities in QFT and aligns with experimental observations. This framework offers a unified, deterministic understanding of virtual particles and the quantum vacuum.

4.6. Relativity

Albert Einstein’s general relativity demonstrates that spacetime curves in the presence of mass and energy, offering a geometric interpretation of gravity. However, the theory does not explicitly define the fundamental nature of either space or gravity, leaving their intrinsic properties an open question—similar to quantum mechanics treatment of time as a parameter, without fundamentally defining its nature. Consequently, a rigorous exploration of Strip Theory’s implications for relativity necessitates first addressing the underlying nature of space and gravity, a task reserved for a subsequent paper. Without this foundational understanding, integrating Strip Theory into the framework of general relativity remains speculative.

4.7. Future Work and Experimental Implications

While the theoretical framework for sidetime is mathematically consistent, experimental validation remains an open question. We propose the following potential avenues for testing:

Prolonged Quantum Coherence: In cryogenic or ultra-high-vacuum environments, sidetime dynamics predict that coherence times may exceed standard quantum mechanical expectations. Experiments with ultra-cold atoms or superconducting qubits could measure whether sidetime effects lead to prolonged interference patterns under isolation.

Interference Pattern Variations: Sidetime predicts subtle variations in multi-slit interference patterns that depend on intrinsic sidetime properties rather than environmental factors. Single-particle multi-slit experiments could be adapted to test these predictions.

These suggestions provide a speculative but promising basis for future experimental exploration of sidetime.

5. Conclusions

Strip Theory extends time to include foretime and sidetime, addressing foundational issues in quantum mechanics. This dual-temporal structure enables continuous coherence within sidetime, bypassing traditional decoherence mechanisms and bridging quantum phenomena with classical emergence. By integrating deterministic evolution and probabilistic outcomes, Strip Theory aligns observer-relative quantum states with consistent identities, resolving limitations of branching models like MWI.

Strip Theory suggests testable predictions, such as prolonged coherence in cryogenic or ultra-high-vacuum environments and deviations in interference patterns detectable by high-precision interferometers. These pathways for empirical validation could distinguish Strip Theory from conventional frameworks and provide opportunities to explore sidetime’s role in quantum phenomena, despite the challenges of direct experimental validation.

While sidetime raises questions about reconciling its implications with current time tests, it is proposed as a complementary framework that enriches existing theories. Future experiments could validate sidetime’s role, advancing our understanding of quantum coherence and harmonising interpretations of quantum reality.