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Universe publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue policies and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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X-ray Astronomy Steps into the 21st Century: Chandra and XMM-Newton at 25

edited by

Eric Schlegel

submission deadline 15 Mar 2025 | 1 articles | Viewed by 1222

Keywords: X-ray astrophysics; high-resolution X-ray imaging; diffraction grating X-ray spectroscopy; active galaxies; X-ray binaries; supernova remnants; normal galaxies; galaxy clusters

(This special issue belongs to the Section Space Science)

Quantum Field Theory in Curved Spacetime and Its Implications for Cosmology, Blackholes and Quantum Gravity

edited by

Korumilli Sravan Kumar

and

Joao Marto

submission deadline 20 Mar 2025 | 8 articles | Viewed by 13460 | Submission Open

Keywords: quantum field theory in curved spacetime; quantum gravity; blackholes; cosmology

(This special issue belongs to the Section Foundations of Quantum Mechanics and Quantum Gravity)

Exploring Double Beta Decay: Probing Fundamental Properties of Neutrinos and Beyond

edited by

Rita Bernabei

submission deadline 31 Mar 2025 | 1 articles | Viewed by 1062 | Submission Open

Keywords: experimental and theoretical topics on double beta decay modes; low-background detectors and methodologies; nuclear matrix

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Cosmological Models of the Universe

edited by

Panayiotis Stavrinos

and

Emmanuel N. Saridakis

submission deadline 1 Apr 2025 | 12 articles | Viewed by 11592 | Submission Open

Keywords: standard cosmological model; dark matter; dark energy; bounce cosmology; inflation cosmology; Λ CDM-cosmology; anisotropic cosmology

(This special issue belongs to the Section Cosmology)

Ultra-High-Energy Cosmic Rays

edited by Haoning He

submission deadline 1 Apr 2025 | 3 articles | Viewed by 2881 | Submission Open

Keywords: high energy neutrino; high energy gamma-ray; ultra-high-energy cosmic rays; particle acceleration; hadronic interactions; anisotropy; composition; multi-messenger astronomy; magnetic fields; Gamma-Ray Bursts (GRBs); galaxy clusters; Active Galactic Nuclei (AGN); Tidal Disruption Events (TDEs); radio galaxies; starburst galaxies; pulsars

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Planetary Radar Astronomy

edited by

Chunyu Ding

and Yan Su

submission deadline 25 Apr 2025 | 2 articles | Viewed by 3871 | Submission Open

Keywords: radar astronomy; lunar and planetary science; lunar and planetary radar detection; lunar and deep space exploration; radar observations of planets within the solar system; radar observations of planets and stars outside the solar system; Chang’ e-3/-4/-5; Tianwen-1 mission and perseverance rover mission; fast radio bursts magnetar radio emission; radio astronomy; multi-messenger observations

(This special issue belongs to the Section Planetary Sciences)

New Discoveries in Astronomical Data

edited by Yanxia Zhang and

A-Li Luo

submission deadline 30 Apr 2025 | 5 articles | Viewed by 9864 | Submission Open

Keywords: machine learning in astronomy; discoveries: from radio to gamma-rays; deep learning; astrostatistics and astroinformatics; data analysis: methods; statistical: astronomical data bases

(This special issue belongs to the Section Astroinformatics and Astrostatistics)

Recent Advances in Gravitational Lensing and Galactic Dynamics

edited by

Francesco De Paolis

Alexander F. Zakharov

and

Luka Č. Popović

submission deadline 30 Apr 2025 | 3 articles | Viewed by 2641 | Submission Open

Keywords: gravitational lensing; weak lensing; astrophysics of black holes and neutron stars; gravitational waves; astrophysical tests of general relativity; relativistic astrophysics; galactic dynamics; JWST; EHT; and Euclid observations; exoplanets

(This special issue belongs to the Section Gravitation)

Dark Energy and Dark Matter

edited by Yan Gong

submission deadline 16 May 2025 | 9 articles | Viewed by 11032 | Submission Open

Keywords: dark energy; dark matter; modified gravity; theoretical model; cosmic acceleration; cosmic large-scale structure; gravitational lensing; galaxy clustering; intensity mapping; cosmological constraint

(This special issue belongs to the Section Cosmology)

Measurements, Observations and Theoretical Studies on the Solar Magnetic Field—Celebrating the 40th Anniversary of the Huairou Solar Observing Station

edited by

Shangbin Yang

, Mei Zhang, Junfeng Hou, Jiaben Lin and

Yu Liu

submission deadline 16 May 2025 | 4 articles | Viewed by 3852 | Submission Open

Keywords: solar magnetic field; solar polarimetry; multi-wavelength diagnostic; topology analysis; astroinformatics; MHD; solar dynamo; space weather forecasting; solar historical data; space projects

(This special issue belongs to the Section Solar and Stellar Physics)

Current Trends in Neutrino Oscillation Physics: A Phenomenological and Experimental Perspective

edited by

Monojit Ghosh

and Budimir Kliček

submission deadline 20 May 2025 | 1 articles | Viewed by 1198 | Submission Open

Keywords: neutrino oscillation; three flavour oscillation; beyond three flavour oscillation; models for neutrino mass and mixing; neutrino experiments; neutrino detectors; neutrino interactions

Probing the Early Universe

edited by

Øyvind Grøn

submission deadline 31 May 2025 | 3 articles | Viewed by 4790 | Submission Open

Keywords: the Planck era (t < 10-43 s); grand unification era (t < 10-36 s); the inflationary era (t < 10-33 s); electroweak epoch (10-33 s < t < 10-12 s); quark era (10-12 s < t < 10-5 s); hadron era (10-5 s < t < 1 s); lepton era with neutrino decoupling (1 s < t < 10 s); cosmic nucleosynthesis (10 s < t < 1000 s); radiation dominated and ‘ foggy’ era (1000 s < t < 380; 000 years); recombination (18; 000 years < t < 380; 000 years); the dark era (380; 000 years < t < 150 million years); first stars and galaxies (200 to 400 million years); cosmic reionization (200 million to 1 billion years)

(This special issue belongs to the Section Cosmology)

A Multiwavelength View of Supernovae

edited by

Vikram Dwarkadas

submission deadline 31 May 2025 | 1 articles | Viewed by 1239 | Submission Open

Keywords: supernovae; core collapse; type Ia; binaries; evolution; circumstellar interactions; emission processes; thermal and non-thermal emission

(This special issue belongs to the Section Solar and Stellar Physics)

Modified Gravity and Dark Energy Theories

edited by Changjun Gao

submission deadline 31 May 2025 | 1 articles | Viewed by 790 | Submission Open

Keywords: dark energy; modified gravity theories; black hole solutions; exact solutions; black hole thermodynamics; nature of spacetime; black hole physics; gravitational waves in modified gravity theories

(This special issue belongs to the Section Gravitation)

Applications of Artificial Intelligence in Modern Astronomy

edited by Bo Qiu

submission deadline 31 May 2025 | Viewed by 358 | Submission Open

Keywords: artificial intelligence; machine learning; astronomy; deep learning; big data; telescope

(This special issue belongs to the Section Astroinformatics and Astrostatistics)

Compact Stars in the QCD Phase Diagram 2024

edited by

David Blaschke

, Toru Kojo, Hajime Sotani and Hajime Togashi

submission deadline 31 May 2025 | Viewed by 281 | Submission Open

Keywords: neutron stars; neutron star mergers; supernovae; warm; dense QCD; heavy-ion collisions

(This special issue belongs to the Section Compact Objects)

A Multimessenger View of Supermassive Black Holes and the Quasar Main Sequence

edited by

Ascension Del Olmo

and

Paola Marziani

submission deadline 1 Jun 2025 | 8 articles | Viewed by 14262 | Submission Open

Keywords: quasars; active galactic nuclei; supermassive black holes; quasar main sequence

(This special issue belongs to the Section Galaxies and Clusters)

Advances in Nuclear Astrophysics

edited by Ragandeep Singh Sidhu, Gavin Lotay and Jaspreet Singh Randhawa

submission deadline 15 Jun 2025 | Viewed by 430 | Submission Open

Keywords: nuclear astrophysics; observational astronomy; nuclear physics; stellar evolution; experimental techniques; fundamental properties

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Loop Quantum Gravity and Non-Perturbative Approaches to Quantum Cosmology, Second Edition

edited by

Gerald B. Cleaver

submission deadline 20 Jun 2025 | 4 articles | Viewed by 3981 | Submission Open

Keywords: quantum gravity; non-perturbative approaches; planck scale; supergravity; non-commutative geometry; loop quantum gravity; loop quantum cosmology; string theory; emergent gravity; Horava-Lifshitz gravity

(This special issue belongs to the Section Cosmology)

Experimental and Observational Constraints on Wormhole Models

edited by João Luís de Figueiredo Rosa

submission deadline 20 Jun 2025 | 1 articles | Viewed by 928 | Submission Open

Keywords: wormholes; compact objects; experimental gravitational physics; model testing and constraining; exotic matter; modified theories of gravity; energy conditions

Origins and Natures of Inflation, Dark Matter and Dark Energy, 2nd Edition

edited by

Kazuharu Bamba

submission deadline 30 Jun 2025 | 8 articles | Viewed by 5793 | Submission Open

Keywords: inflation; dark matter; dark energy; alternative theory of gravity; cosmology; physics in the early universe; cosmological perturbation theory; cosmic microwave background radiation; gravitational waves; large-scale structure of the universe

(This special issue belongs to the Section Cosmology)

Studying Astrophysics with High-Energy Cosmic Particles

edited by Kinwah Wu and

Ellis R. Owen

submission deadline 30 Jun 2025 | 4 articles | Viewed by 4265 | Submission Open

(This special issue belongs to the Section Cosmology)

Variable Stars in the 21st Century: From Microvariability to Megavariability

edited by

Laszlo Szabados

and Tamas Szalai

submission deadline 30 Jun 2025 | 2 articles | Viewed by 1276 | Submission Open

Keywords: stellar variability; sky surveys; time-domain astrophysics; astrophysical transients; individual variable stars

(This special issue belongs to the Section Solar and Stellar Physics)

New Frontiers in Particle Physics with Quantum Sensing

edited by

Giuseppe Latino

submission deadline 30 Jun 2025 | Viewed by 307 | Submission Open

Keywords: particle physics; new physics; dark matter search; quantum sensing; new detection techniques

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Tensions, Anomalies, and Challenges in the Standard Cosmological Model

edited by

John P. Ralston

and Pavan Kumar Aluri

submission deadline 30 Jun 2025 | Viewed by 188 | Submission Open

Keywords: standard cosmological model— anomalies; tensions; challenges; cosmological principle; Hubble tension; S8 tension; dark matter and dark energy; early- and late-time probes

(This special issue belongs to the Section Cosmology)

Astrophysics and Cosmology at High Z

edited by

Júlio César Fabris

and

Hermano Velten

submission deadline 30 Jun 2025 | Viewed by 62 | Submission Open

Keywords: astrophysics; cosmology; high-redshift surveys; structures in the universe; dark sector of the universe

(This special issue belongs to the Section Cosmology)

keV Warm Dark Matter (ΛWDM) in Agreement with Observations in Tribute to Héctor J. de Vega (2nd Edition)

edited by

Norma G. Sanchez

submission deadline 15 Jul 2025 | Viewed by 406 | Submission Open

Keywords: keV warm dark matter; keV warm dark matter theory; constraints; and observations; keV warm dark matter galaxies; keV warm dark matter supermassive black holes; keV warm dark matter particles; keV warm dark matter (direct and indirect) detection; neutrinos and sterile neutrinos; dark matter production models; direct and indirect searches

(This special issue belongs to the Section Gravitation)

The First Stars: Keys to Understanding Dark Matter

edited by

Øyvind Grøn

submission deadline 25 Jul 2025 | Viewed by 215 | Submission Open

Keywords: dark matter; first stars; early universe; WIMPs (weakly interacting massive particles); James Webb Space Telescope

(This special issue belongs to the Section Cosmology)

Universe: Feature Papers 2024—'Cosmology'

edited by

Jaime Haro Cases

and

Supriya Pan

submission deadline 31 Jul 2025 | 9 articles | Viewed by 10082 | Submission Open

Keywords: cosmological models; quantum cosmology; dark matter and dark energy; cosmic acceleration; cosmological constants; cosmological perturbation theory; cosmic microwave background (CMB); observational cosmology

(This special issue belongs to the Section Cosmology)

Multi-wavelength Properties of Active Galactic Nuclei

edited by

Stefano Vercellone

submission deadline 31 Jul 2025 | 1 articles | Viewed by 1226 | Submission Open

Keywords: active galactic nuclei; black-hole physics; accretion; winds; jets; emission mechanism; theoretical modelling; observing facilities; software and databases

(This special issue belongs to the Section Galaxies and Clusters)

Advances in Studies of Galaxies at High Redshift

edited by Krisztina Éva Gabányi

submission deadline 31 Jul 2025 | 2 articles | Viewed by 1084 | Submission Open

Keywords: high-redshift galaxies; active galaxies; quasars; supermassive black holes; star formation; galaxy evolution; early universe; cosmology; observational astronomy; simulations

(This special issue belongs to the Section Galaxies and Clusters)

Neutrino Insights: Peering into the Subatomic Universe

edited by Guillermo D. Megias

submission deadline 31 Aug 2025 | 2 articles | Viewed by 1672 | Submission Open

Keywords: neutrino physics; neutrino oscillations; electroweak interactions; CP violation; solar and atmospheric neutrinos; long-baseline accelerators; neutrino-nucleus reactions; low and high energy neutrinos

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Cosmological Perturbations: From the Early Universe to Late-Time Evolution

edited by Giovanni Otálora

submission deadline 31 Aug 2025 | Viewed by 66 | Submission Open

Keywords: cosmological perturbations; quantum fluctuations; primordial gravitational waves; primordial black holes; inflationary models; modified gravity; large-scale structure; stochastic gravitational wave background; non-Gaussianity; dark energy perturbations

(This special issue belongs to the Section Cosmology)

Supermassive Black Hole Mass Measurements

edited by Benjamin Boizelle

submission deadline 21 Sep 2025 | Viewed by 60 | Submission Open

Keywords: supermassive black holes; active galactic nuclei; stellar or gaseous kinematics; dynamical modeling

(This special issue belongs to the Section Compact Objects)

Bouncing Cosmology and the Early Universe: From Theory to Observations

edited by Arnab Dasgupta

submission deadline 30 Sep 2025 | Viewed by 123 | Submission Open

Keywords: bouncing cosmology; cyclic universe; cosmic microwave background (CMB); matter– antimatter asymmetry; dark energy and dark matter

(This special issue belongs to the Section Cosmology)

Multi-Messenger Astrophysics: Synergies Between Cosmic Rays, Gravitational Waves, Neutrinos, and Electromagnetic Signals

edited by

Gina Isar

and Günter Sigl

submission deadline 30 Sep 2025 | Viewed by 87 | Submission Open

Keywords: cosmic rays and air showers; high-energy gamma-rays and neutrinos gravitational waves; acceleration mechanisms and propagation; cosmic magnetic fields; cosmic ray anisotropies; multi-messenger and multi-wavelength signals; detection methods; hadronic interaction models; machine learning and high performance computing

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Extensions of General Relativity and Applications to Cosmology and Gravitation

edited by Mauricio Bellini, Mariano Anabitarte and

Herbert W. Hamber

submission deadline 30 Sep 2025 | Viewed by 72 | Submission Open

Keywords: extended general relativity; gravitation; cosmology; early universe; topological defects; black holes; Hawking radiation; cosmic strings; quantum gravity; extended manifolds; Weyl manifolds; dark energy; dark matter

(This special issue belongs to the Section Gravitation)

Geometric Theories of Gravity

edited by

László Árpád Gergely

submission deadline 30 Sep 2025 | Viewed by 62 | Submission Open

Keywords: spacetime; general relativity and its geometric reformulations; modified gravity: formal aspects and applications; perturbations and gravitational waves; cosmology; dark matter; and dark energy models

(This special issue belongs to the Section Gravitation)

The Lifecycle of Massive Stars

edited by

Jacco Th. van Loon

submission deadline 15 Oct 2025 | Viewed by 106 | Submission Open

Keywords: massive stars; star formation; stellar evolution; stellar mass loss; stellar winds; supernova progenitors; binary stars; stellar magnetism; stellar rotation; population III

(This special issue belongs to the Section Solar and Stellar Physics)

The 10th Anniversary of Universe: Standard Cosmological Models, and Modified Gravity and Cosmological Tensions

edited by

Panayiotis Stavrinos

Antonino Del Popolo

Hermano Velten

, Tina Kahniashvili,

Jean-Michel Alimi

and

Yi-Fu Cai

submission deadline 31 Oct 2025 | 2 articles | Viewed by 965 | Submission Open

Keywords: general relativity and its extensions; modified gravity; Λ CDM cosmological model; dark matter; dark energy; hubble tension; gravitational waves; scalar-tensor theories; cosmological anisotropies

Search for New Physics Through Combined Approaches

edited by Yang Zhang and

Fei Wang

submission deadline 31 Oct 2025 | 1 articles | Viewed by 617 | Submission Open

Keywords: beyond standard model physics; grand unified theory; collider physics; Higgs physics; electroweak precision measurements; dark matter; electroweak phase transition; gravitational wave

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

10th Anniversary of Universe: Studying the Strongly Interacting Matter in Nuclear Reactions from Intermediate to Ultra-Relativistic Energies

edited by

Máté Csanád

, Panos Christakoglou,

Giuseppe Verde

and You Zhou

submission deadline 31 Oct 2025 | Viewed by 120 | Submission Open

Keywords: quark-gluon plasma; nuclear interactions; heavy-ion physics; strong interaction; phase diagram

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

10th Anniversary of Universe: Galaxies and Their Black Holes

edited by

Paola Marziani

submission deadline 31 Oct 2025 | Viewed by 119 | Submission Open

Keywords: supermassive black holes; accretion; galactic evolution; feedback; multimessenger astronomy; high-redshift universe; stellar- and intermediate-mass black holes

New Progress of Black Hole Accretion Disk

edited by Arghajit Jana

submission deadline 31 Oct 2025 | Viewed by 58 | Submission Open

Keywords: active galactic nuclei; black holes; X-ray binaries; X-ray polarization; reverberation technique; accretion; accretion disk; jet; disk– jet couplings; quasars; Seyfert; blazars

(This special issue belongs to the Section Gravitation)

Ultra-High Energy Cosmic Rays: Past, Present and Future

edited by

Dmitriy Kostunin

and Vladimir Lenok

submission deadline 31 Oct 2025 | Viewed by 45 | Submission Open

Keywords: ultra-high energy cosmic rays; astrophysical neutrino; high-energy gamma rays; multimessenger astronomy; cosmic accelerators

(This special issue belongs to the Section Space Science)

Magnetic Fields and Activity in Stars: Origins and Evolution

edited by

Renada Konstantinova-Antova

submission deadline 21 Nov 2025 | Viewed by 59 | Submission Open

Keywords: magnetic fields; magnetic activity; stellar evolution; dynamos in stars; star– planet interaction; spectropolarimetry; asteroseismology; stellar atmospheres

(This special issue belongs to the Section Solar and Stellar Physics)

Studies of Hadron Spectroscopy at the Future Electron-Hadron and Electron-Ion Colliders

edited by Vladimir Khachatryan and Wenliang Li

submission deadline 30 Nov 2025 | Viewed by 328 | Submission Open

Keywords: quantum chromodynamics; electron scattering; electron-hadron colliders; hadron spectroscopy; conventional & non-conventional hadronic states; photo & electroproduction processes; exclusive & inclusive processes; fragmentation & hadronization

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

BGL2025: The 13th Bolyai–Gauss–Lobachevsky Conference on Non-Euclidean Geometry and Its Applications

edited by Taoufik Ouali,

Tiberiu Harko

, László Jenkovszky, Ahmed Errahmani and

Amine Bouali

submission deadline 30 Dec 2025 | Viewed by 114 | Submission Open

Keywords: advances in mathematics; recent developments in physics; mathematics– physics dialogue; modified gravity theories; the Hubble tension; quantum gravity; cosmology; gravitational waves; complex systems; chaos and instability

Current Status of the Hubble Tension

edited by

Giovanni Montani

Eleonora Di Valentino

and Nakia Carlevaro

submission deadline 31 Dec 2025 | 4 articles | Viewed by 3847 | Submission Open

Keywords: Hubble tension; dark matter; dark energy; dark matter/dark energy interaction; quintessence; late universe physics; cosmology from modified gravity; early universe dark energy; model testing; data analysis

(This special issue belongs to the Section Cosmology)

Exploring Low-Frequency Gravitational Wave Sources: Waveforms, Detection and Sciences

edited by Wenbiao Han, Ziren Luo and Shucheng Yang

submission deadline 31 Dec 2025 | 3 articles | Viewed by 2251 | Submission Open

Keywords: gravitational waves; black holes; tests of theories of gravity; machine learning; data analysis

(This special issue belongs to the Section Gravitation)

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