Renormalized Free Energy on Space-time with Compact Hyperbolic Spatial Part

TL;DR

This paper explicitly calculates the renormalized free energy of an interacting scalar field on a compact hyperbolic manifold, revealing a relationship between curvature, temperature, and equilibrium states.

Contribution

It provides a complete expression for free energy and entropy in terms of curvature and temperature, showing how the universe's curvature evolves towards equilibrium.

Findings

Existence of a minimum free energy with respect to curvature depending on temperature

Stationary curvature increases with temperature

Universe reaches low curvature and temperature equilibrium, resulting in flat spacetime

Abstract

In this paper we found the renormalized free energy of a interacting scalar field on a compact hyperbolic manifold explicitly. We have shown a complete expression of the free energy and entropy as a function of the curvature and the temperature. Carefully analyzing the free energy we have shown that there exist a minimum with respect to the curvature that depend on the temperature. The principle of minimum free energy give us an estimate of the connection between stationary curvature and temperature. As a result we obtain that the stationary curvature increases when the temperature increases too. If we start from an universe with very high curvature and temperature in the beginning, because of the principle of minimum free energy, the universe will reach a new situation of equilibrium for low temperature and low curvature. Consequently, the flat space-time is obtained for low temperature.