Observational constraints on entropic cosmology

TL;DR

This paper derives a generalized entropic cosmology model incorporating various entropy modifications, tests it against observational data, and finds it consistent with current measurements, including the Hubble constant.

Contribution

It introduces a novel generalized Friedmann equation with multiple entropy modifications and constrains its parameters using diverse cosmological observations.

Findings

Models fit well with observational data at low redshift

Compatible with SH0ES H_0 measurements

Can mimic dark energy effects

Abstract

In this work, we derive a generalized modified Friedmann equation based on an entropy-area relation that incorporates established modifications, such as volumetric, linear, and logarithmic terms, in addition to novel entropic modifications that might yield to relevant cosmological implications at different stages of the evolution of the Universe. Some of these modifications are capable of mimicking the effects of dark energy and describing the current state of accelerated expansion of the Universe. We study particular cases of the generalized Friedmann equation and constrain the free parameters using observational datasets, including Hubble parameter measurements, baryon acoustic oscillations, and strong lensing systems. Our findings indicate that the proposed models align well with current observational data, particularly in low-redshift regimes; furthermore, these models are compatible with the value of $H_0$ obtained by the SH0ES program.