Loo, Tee-How and Solanki, Raja and De, Avik and Sahoo, P. K. (2023) f (Q, T) gravity, its covariant formulation, energy conservation and phase-space analysis. European Physical Journal C, 83 (3). ISSN 1434-6044, DOI https://doi.org/10.1140/epjc/s10052-023-11391-4.
Full text not available from this repository.Abstract
In the present article we analyze the mattergeometry coupled f (Q, T) theory of gravity. We offer the fully covariant formulation of the theory, with which we construct the correct energy balance equation and employ it to conduct a dynamical system analysis in a spatially flat Friedmann-Lemaitre-Robertson-Walker spacetime. We consider three different functional forms of the f (Q, T) function, specifically, f (Q, T) = alpha Q + beta T, f ( Q, T) = alpha Q + beta T-2, and f (Q, T) = Q + alpha Q(2) + beta T. We attempt to investigate the physical capabilities of these models to describe various cosmological epochs. We calculate Friedmann-like equations in each case and introduce some phase space variables to simplify the equations in more concise forms. We observe that the linear model f (Q, T) = alpha Q + beta T with beta = 0 is completely equivalent to the GR case without cosmological constant Lambda. Further, we find that the model f (Q, T) = alpha Q + beta T-2 with beta not equal 0 successfully depicts the observed transition from decelerated phase to an accelerated phase of the universe. Lastly, we find that the model f (Q, T) = Q + alpha Q(2) + beta T with a not equal 0 represents an accelerated de-Sitter epoch for the constraints beta < -1 or beta = 0.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education (MoHE), through the Fundamental Research Grant Scheme [Grant No: FRGS/1/2021/STG06/UTAR/02/1], University Grants Commission, India [Grant No: 191620096030], Science and Engineering Research Board, Department of Science and Technology, Government of India [Grant No: CRG/2022/001847] |
| Uncontrolled Keywords: | Theory of gravity; Cosmological epochs |
| Subjects: | Q Science > QA Mathematics |
| Divisions: | Faculty of Science > Institute of Mathematical Sciences |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 27 Nov 2024 03:58 |
| Last Modified: | 27 Nov 2024 03:58 |
| URI: | http://eprints.um.edu.my/id/eprint/38401 |
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