Entropy evolution in warm inflation from a 5D vacuum

TL;DR

This paper investigates how entropy evolves during warm inflation by applying 5D vacuum state concepts from Kaluza-Klein theory, revealing significant entropy production exceeding 10^{90} during inflation.

Contribution

It introduces a novel approach using 5D vacuum states to analyze entropy evolution in warm inflation, connecting higher-dimensional theories with cosmological entropy.

Findings

Entropy production exceeds 10^{90} during inflation

Entropy evolution is influenced by initial temperature T_0

The model links 5D vacuum states with 4D entropy dynamics

Abstract

Using some ideas of Modern Kaluza-Klein theory, we examine the evolution of entropy on a 4D Friedmann-Robertson-Walker (FRW) brane from a 5D vacuum state, which is defined on a 5D background Riemann-flat metric. We found that entropy production is sufficiently important during inflation: $S > 10^{90}$, for all the initial values of temperature $T_0 < T_{GU}$.