De, Avik and Loo, Tee-How and Arora, Simran and Sahoo, P. K. (2021) Energy conditions for a (WRS)(4) spacetime in F(R)-gravity. European Physical Journal Plus, 136 (2). ISSN 2190-5444, DOI https://doi.org/10.1140/epjp/s13360-021-01216-2.
Full text not available from this repository.Abstract
The objective of the present paper is to study four-dimensional weakly Ricci symmetric spacetimes (WRS)(4) with nonzero constant Ricci scalar. We prove that such a (WRS)(4) satisfying F(R)-gravity field equations represents a perfect fluid with vanishing vorticity. Some energy conditions are studied under the current setting to constrain the functional form of F(R). We examine a couple of popular toy models in F(R)-gravity, F(R) = e(alpha R) where alpha is constant and F(R) = R - beta tanh(R), beta is a constant. We also find that the equation of state parameter (EoS) in both models supports the universe's accelerating behavior, i.e., omega = -1. According to the recently suggested observations of accelerated expansion, both cases define that the null, weak, and dominant energy conditions justify their requirements while the strong energy conditions violate them.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Energy conditions; (WRS)(4); F(R)-gravity |
| Subjects: | Q Science > QA Mathematics |
| Divisions: | Faculty of Science > Institute of Mathematical Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 08 Mar 2022 03:11 |
| Last Modified: | 08 Mar 2022 03:11 |
| URI: | http://eprints.um.edu.my/id/eprint/26488 |
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