# Reconsidering the horizon problem

## TL;DR

The paper proposes that the universe's initial homogeneity can be explained by thermodynamic principles, challenging the need for prior inhomogeneous states to account for the early universe's uniformity.

## Contribution

It introduces a thermodynamic perspective on the horizon problem, suggesting initial homogeneity arises naturally from gravitational entropy considerations.

## Key findings

- Homogeneity can be derived from thermodynamics without prior inhomogeneity.
- Gravitational systems tend toward states of higher entropy, explaining early uniformity.
- Challenges traditional explanations requiring prior inhomogeneous conditions.

## Abstract

It is argued that the spatial homogeneity of the early universe need not be explained as having evolved from a previous inhomogeneous state. Rather, a homogeneous cosmic initial condition follows from the Second Law of Thermodynamics applied to gravitating systems.