Dynamical Chern-Simons modified gravity and Friedmann-Robertson-Walker metric

TL;DR

This paper investigates the compatibility of the Friedmann-Robertson-Walker metric with dynamical Chern-Simons modified gravity, revealing implications for cosmic acceleration and modifications to the universe's total density.

Contribution

It demonstrates the conditions under which the FRW metric is consistent with dynamical Chern-Simons gravity and explores its effects on cosmic expansion and density.

Findings

Accelerated expansion similar to Chaplygin gas models

Modification alters the universe's total density

Provides conditions for consistent FRW and Chern-Simons gravity

Abstract

We study the conditions for the consistency of the Friedmann-Robertson-Walker (FRW) metric with the dynamical Chern-Simons modified gravity. It turns out to be that in this situation the accelerated expansion of the Universe takes place, with the time dependence of the scale factor turns out to be similar to the case of presence of the Chaplygin gas. Also we found that this modification changes the total density of the Universe and therefore gives a nontrivial impact to a cosmological scenario.