Four-dimensional Brane-Chern-Simons Gravity and Cosmology
General Relativity and Quantum Cosmology
2021-02-03 v2
Abstract
From the field equations corresponding to a 4-dimensional brane embedded in the 5-dimensional spacetime of the Einstein-Chern-Simons theory for gravity, we find cosmological solutions that describe an accelerated expansion for a flat universe. Apart from a quintessence-type evolution scheme, we obtain a transient phantom evolution, which is not ruled out by the current observational data. Additionally, a bouncing solution is shown. The introduction of a kinetic term in the action shows a de Sitter behavior although the energy density is not constant. A quintessence behavior is also found. We conjecture on a possible geometric origin of dark energy coming from this action.
Cite
@article{arxiv.2012.10578,
title = {Four-dimensional Brane-Chern-Simons Gravity and Cosmology},
author = {F. Gómez and S. Lepe and P. Salgado},
journal= {arXiv preprint arXiv:2012.10578},
year = {2021}
}