A Note on the Cosmological Dynamics in Finite-Range Gravity

TL;DR

This paper explores the cosmological behavior of a finite-range gravity model, showing that late-time accelerated expansion can occur as an attractor when certain conditions on massive gravitons are met.

Contribution

It provides a phase space analysis of finite-range gravity, demonstrating conditions under which the universe's late-time acceleration emerges as an attractor.

Findings

Late-time acceleration occurs if both massive gravitons are tachyons

The accelerated expansion is a stable attractor in the model's phase space

Finite-range gravity can explain cosmic acceleration without dark energy

Abstract

In this note we consider the homogeneous and isotropic cosmology in the finite-range gravity theory recently proposed by Babak and Grishchuk. In this scenario the universe undergoes late time accelerated expansion if both the massive gravitons present in the model are tachyons. We carry out the phase space analysis of the system and show that the late-time acceleration is an attractor of the model.