Modified Entropic Gravity and Cosmology

TL;DR

This paper reviews phenomenological models of entropic gravity modifications, exploring their potential to explain cosmic acceleration and inflation, and discusses observational constraints and conflicts with simple inflation models.

Contribution

It summarizes recent work on using cosmology to constrain entropic-inspired modified gravity models, highlighting their successes and limitations.

Findings

Modified gravity models can explain cosmic acceleration at the background level.

Simple inflation models with higher curvature corrections conflict with late-time matter domination.

Cosmological observations can constrain entropic gravity scenarios.

Abstract

It has been recently proposed that gravity might be an entropic force. Although a well defined fundamental description for such a mechanism is still lacking, it is still possible to address the viability of phenomenological models of entropic-inspired modified gravities. I will summarize some recent work directed to using cosmology as a tool to constraint scenarios in which the modifications are aimed to explain the physics behind dark energy and inflation. A phenomenological modification is able to explain cosmic acceleration at the background level and fit observations, but simple inflation models with higher curvature corrections are in conflict with late time matter domination.