Cosmology in massive gravity

TL;DR

This paper explores cosmological solutions in massive gravity, showing that homogeneous and isotropic metrics lead to standard cosmology and ΛCDM, with modifications at early times.

Contribution

It demonstrates that homogeneous and isotropic metric and St"{u}ckelberg tensor solutions in massive gravity can reproduce standard cosmology and ΛCDM models.

Findings

Standard cosmology with matter and radiation is recovered.

ΛCDM model is easily obtained within this framework.

Early universe dynamics are modified by massive gravity effects.

Abstract

We argue that more cosmological solutions in massive gravity can be obtained if the metric tensor and the tensor $\Sigma_{\mu\nu}$ defined by St\"{u}ckelberg fields take the homogeneous and isotropic form. The standard cosmology with matter and radiation dominations in the past can be recovered and $\Lambda$CDM model is easily obtained. The dynamical evolution of the universe is modified at very early times.