The Time-Asymmetry and the Entropy Gap

TL;DR

This paper explores how the universe's initial low-entropy state and expansion influence its entropy gap, providing a qualitative model that aligns with some observational data to explain the universe's time asymmetry.

Contribution

It introduces a simple homogeneous model to qualitatively analyze how universe expansion affects the entropy gap and its relation to the universe's low-entropy initial state.

Findings

Expansion may reduce the entropy gap over time

Qualitative model aligns with some observational data

Supports the idea that initial low entropy explains time asymmetry

Abstract

The universe time-asymmetry is essentially produced by its low-entropy unstable initial state. Using quanlitative arguments, Paul Davies has demonstrated that the universe expansion may diminish the entropy gap, therefore explaining its low-entropy state, with respect to the maximal possible entropy at any time. This idea is implemented in a qualitative way\thinspace in a simple homogeneous model. Some rough coincidence with observational data are found