English

Cosmology of unimodular Born-Infeld-$f(R)$ gravity

General Relativity and Quantum Cosmology 2024-02-16 v1

Abstract

We propose a novel modified gravity: unimodular generalization of the Born-Infeld-f(R)f(R) gravity within the framework of cosmology. After formulating the action corresponding to the generalized Born-Infeld-f(R)f(R) gravity, we present a reconstruction scheme of this unimodular extension to achieve various cosmological eras of the universe. Interestingly, the unimodular generalization of Born-Infeld-f(R)f(R) gravity proves to be suitable for inflation (de-Sitter and quasi de-Sitter) along with power law cosmology which actually includes from reheating to the Standard Big-Bang cosmology. Apart from the inflation, such generalized Born-Infeld-f(R)f(R) theory is also capable to trigger non-singular bouncing cosmology for suitable forms of the unimodular Lagrange multiplier, which are exotic for the standard Einstein-Hilbert gravity and cannot be realized in that case. The possible consequences are discussed.

Keywords

Cite

@article{arxiv.2402.08951,
  title  = {Cosmology of unimodular Born-Infeld-$f(R)$ gravity},
  author = {Salih Kibaroğlu and Sergei D. Odintsov and Tanmoy Paul},
  journal= {arXiv preprint arXiv:2402.08951},
  year   = {2024}
}

Comments

18 pages, 4 figures. Accepted by Physics of the Dark Universe