Phenomenological modification of horizon temperature

TL;DR

This paper explores phenomenological modifications to horizon temperature to explain the universe's accelerated expansion, linking thermodynamics and gravity, and constrains models using observational data.

Contribution

It introduces a new approach by modifying horizon temperature phenomenologically to derive cosmological equations and tests these models against observational data.

Findings

Modified models can account for accelerated expansion

Constraints on model parameters from observational data

Potential thermodynamic interpretation of spacetime dynamics

Abstract

In this paper a study of the accelerated expansion problem of the large scale universe is presented. To derive Friedmann like equations, describing the background dynamics of the recent universe we take into account, that it is possibile to interpret the spacetime dynamics as an emergent phenomenon. It is a consequence of the deep study of connection between gravitation and thermodynamics. Considered models are based on phenomenological modifications of the horizon temperature. In general, there are various reasons to modify the horizon temperature and one of them can be related to the feedback from the spacetime on the horizon, which will generate additional heat. In order to constraint the parameters of the models we use $Om$ analysis and the constraints on this parameter at $z=0.0$, $z=0,57$ and $z=2.34$.