De, Avik and Loo, Tee How and Saridakis, Emmanuel N. (2024) Non-metricity with boundary terms: f(Q, C) gravity and cosmology. Journal of Cosmology and Astroparticle Physics (3). 050. ISSN 1475-7516, DOI https://doi.org/10.1088/1475-7516/2024/03/050.
Full text not available from this repository.Abstract
We formulate f(Q, C) gravity and cosmology. Such a construction is based on the symmetric teleparallel geometry, but apart form the non-metricity scalar Q we incorporate in the Lagrangian the boundary term C of its difference from the standard Levi-Civita Ricci scalar R. We extract the general metric and affine connection field equations, we apply them at a cosmological framework, and adopting three different types of symmetric teleparallel affine connections we obtain the modified Friedmann equations. As we show, we acquire an effective dark -energy sector of geometrical origin, which can lead to interesting cosmological phenomenology. Additionally, we may obtain an effective interaction between matter and dark energy. Finally, examining a specific model, we show that we can obtain the usual thermal history of the universe, with the sequence of matter and dark -energy epochs, while the effective dark -energy equation -of -state parameter can be quintessence -like, phantom -like, or cross the phantom -divide during evolution.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education (MoHE) , through the Fundamental Research Grant Scheme (FRGS/1/2021/STG06/UTAR/02/1), European Cooperation in Science and Technology (COST) (CA18108); (CA21136) |
| Uncontrolled Keywords: | modified gravity; dark energy theory |
| Subjects: | Q Science > QA Mathematics |
| Divisions: | Faculty of Science > Institute of Mathematical Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 22 Oct 2024 08:40 |
| Last Modified: | 22 Oct 2024 08:40 |
| URI: | http://eprints.um.edu.my/id/eprint/45498 |
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