Symmetries in Gravity Research: Classical and Quantum
A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".
Deadline for manuscript submissions: 30 September 2024 | Viewed by 2327
Special Issue Editors
Interests: gravitation; gravitational waves detectors
Interests: physics (with emphasis on gravitation and astrophysics, including cosmology); engineering (with emphasis on signal analysis, mathematical modelling of systems and electromechanical transducers)
Special Issue Information
Dear Colleagues,
The analysis of symmetries is often performed to investigate, simplify and solve physical problems. For instance, in general relativity (GR), spherical symmetry is important in calculating the Schwarzschild solution, as well as in proving the nonexistence of gravitational radiation emission from a spherically pulsating star. Symmetries also relate to preserved properties as geodesics in spacetime.
Two pillars of modern physics, GR and quantum mechanics (QM), separately agree well with experimental tests in certain domains. However, when the two theories are applied to describe the same phenomenon, they are likely to fail as GR resources do not work properly within the domains of QM. It is believed that GR is a low-gravitational field approximation to a more fundamental theory, quantum gravity (QG), which may require the development of new approaches to gravity for its full description.
In order to develop QG or to have a better understanding of gravitation, it is unavoidable to study gravity in the strong regime, which is still experimentally unattainable. One compelling option is to explore symmetries to understand gravitation in this regime.
Prof. Dr. Carlos Frajuca
Prof. Dr. Nadja Simão Magalhães
Guest Editors
Manuscript Submission Information
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Keywords
- symmetries
- symmetries in gravitation
- symmetries in quantum gravity
- preserving properties in gravitation
- symmetries in general relativity
Planned Papers
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Second order inflationary perturbations of the inflation potential and its symmetries
Authors: Paulo Sergio Custodio1; Cristian Ghezzi2; Nadja Simao Magalhaes3; Carlos Frajuca4
Affiliation: 1. UNIP, Sao Paulo, SP, Brazil 2. Independent Researcher, Bahia Blanca, Argentina 3. Unifesp, Diadema, SP, Brazil 4. FURG, Rio Grande, RS, Brazil
Abstract: In inflationary cosmology the form of the inflaton potential is still an open problem. In this work, second order effects of the Inflaton potential are evaluated and related to the known formula for the inflationary perturbations in a wide range of scales. It is found that the fluctuations in large scales are smaller in amplitude according to the observed pattern measured by MAP and other experiments. This effect may help to unravel the unknown Inflaton potential form and imposes new constraints on the parameters that define this potential. Symmetry conditions that are present when the signal of the inflaton changes are discussed.