Cosmic implications on thermodynamics and the explanation of the so called horizon problem

TL;DR

This paper explores how the initial cosmic singularity influences thermodynamics, proposing that entropy density approaches zero at the universe's beginning, offering a novel explanation for the horizon problem.

Contribution

It introduces a thermodynamic perspective on the initial singularity, suggesting entropy behavior differs from standard models and addresses the horizon problem.

Findings

Entropy density approaches zero as cosmic time approaches zero.

Thermodynamic implications provide a conceptual explanation for the horizon problem.

Early universe thermodynamics differ significantly from current behavior.

Abstract

We show that there are implications on thermodynamics that come from the existence of the initial cosmic singularity. At present time this is more a conceptual change than an observable one. However at very early cosmic times there is a big difference between the actual behavior of thermodynamic quantities and the behavior assumed in the standard cosmological model. We present the discussion of two systems: an ideal monatomic gas at present, and a photon gas at the early Universe. We show the striking result that the entropy density goes to zero as the cosmic time goes to zero. This in turn, provides an explanation for the so called horizon problem.