Symmetry in Gravity Theories and Cosmology
A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".
Deadline for manuscript submissions: 30 April 2024 | Viewed by 905
Special Issue Editors
Interests: gravitation and cosmology; astrophysics, nuclear equation of state
Interests: theoretical nuclear physics; cosmology
Special Issue Information
Dear Colleagues,
The late-time cosmic speed-up phenomenon, as witnessed in recent observations, has triggered the development of new ideas and concepts. Einstein’s general relativity (GR) theory is able to explain such a phenomenon through the incorporation of additional dynamical degrees of freedom, such as quintessence, tachyons, phantom fields, etc., usually dubbed as dark energy candidates. However, geometrically modified theories of gravity can handle this issue without the need for any dark energy candidates. On the other hand, theoretical shortcomings and tensions between different cosmological observations have raised questions about GR, at least at the large energy scale. Additionally, questions about the symmetrical expansion of the universe have arisen. In this context, symmetry plays an important role in addressing many issues arising in the fields of cosmology and astrophysics. Usually, for a dynamical system, different symmetries, such Noether symmetry and the non-local conservation laws, help to simplify the system of equations, allowing physical systems to be studied in an analytic manner.
This Special Issue aims to present the role played by symmetries and conservation laws in addressing issues in gravitation and cosmology concerning recent research challenges.
Dr. Sunil Kumar Tripathy
Dr. Dipanjali Behera
Dr. Hooman Moradpour
Guest Editors
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
Keywords
- wormholes
- Casimir wormholes
- modified theories of gravity
- bouncing cosmological models
- observational constraints on modified gravity theories
- dark energy models
- Noether symmetry
- scalar field cosmology
- exact solutions
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: A review of wormhole stabilization in f(R) gravity theories
Authors: Ramesh Radhakrishnan, Patrick Brown, Jacob Matulevich and Gerald Cleaver
Affiliation: 1. Early Universe, Cosmology and Strings (EUCOS) Group, Center for Astrophysics, Space Physics and Engineering Research (CASPER), Baylor University, Waco, TX 76798
2. Department of Physics, Baylor University, Waco, TX 76798, USA
Abstract: It has been proven that in standard Einstein gravity, exotic matter (i.e. matter violating the weak and null energy conditions) is required to stabilize traversable wormholes. Quantum field theory does, theoretically, permit these violations. In the case of the Casimir effect, these violations have been experimentally proven. However, it is still unknown if it is possible to create these violations on a macroscopic scale. Therefore, it is advantageous to investigate methods of minimizing the use of exotic matter. One such area of interest is extended theories of Einstein gravity. It has been claimed that in some extended theories, stable traversable wormholes solutions can be found without the use of exotic matter. There are many extended theories of gravity. In this review paper we first explore f(R) theories and then explore some wormhole solutions in f(R) theories including Einstein-Gauss-Bonnet gravity and Lovelock gravity.