Cosmology of Einstein-Vlasov system in a weak modification of general relativity

TL;DR

This paper explores a modified gravity model incorporating a third polarization mode, leading to a cosmological solution consistent with observations and potentially explaining dark energy.

Contribution

It introduces a new cosmological solution to the Einstein-Vlasov system within a weakly modified gravity framework, accounting for dark energy effects.

Findings

The model produces results within standard cosmological bounds.

The third polarization mode contributes to dark energy interpretation.

The solution aligns with observational data.

Abstract

In earlier work it was shown that a weak modification of general relativity, in the linearized approach, renders a spherically symmetric and stationary model of the Universe. This was due to the presence of a third mode of polarization in the linearized gravity in which a "curvature energy" term is present. Such term was identified as the Dark Energy of the Universe. In this letter a more realistic model is discussed. A different cosmological solution to the Einstein-Vlasov System is analysed. This solution shows reasonable results which are within the standard bounds predicted by the cosmological observations.