Modified gravity as realistic candidate for dark energy, inflation and dark matter

TL;DR

This paper reviews how local and non-local modified gravity models can unify early inflation and late-time acceleration, with dark matter effects arising from composite gravitons, all consistent with observational tests.

Contribution

It demonstrates that both local and non-local modified gravity models can unify inflation, dark energy, and dark matter phenomena while satisfying Solar System and cosmological constraints.

Findings

Modified gravity models can unify inflation and dark energy.

Non-local corrections do not hinder unification.

Dark matter effects can be explained by composite gravitons.

Abstract

We review the unification of early-time inflation with late-time acceleration in several local modified gravity models which pass Solar System and cosmological tests. It is also demonstrated that account of non-local gravitational corrections to the action does not destroy the possibility of such unification. Dark matter effect is caused by composite graviton degree of freedom in such models.