Thermal and Dynamical Particle Creation in a Curved Geometry

TL;DR

This paper extends thermal field dynamics to curved spacetime, showing how thermal and geometric effects amplify particle creation and cause frequency redshift in a Robertson-Walker universe.

Contribution

It introduces a generalized framework for thermal field dynamics in curved geometry, specifically applied to scalar fields in cosmological settings.

Findings

Nonlinear amplification of particle creation due to combined thermal and geometric effects

Frequencies appear redshifted when thermal creation is included

Extension of thermal field dynamics to curved spacetime

Abstract

A generalization of ``Termo Field Dynamics'' to a curved geometry is proposed. In particular a neutral scalar field minimally coupled to gravity is considered as matter content in a Robertson-Walker metric. A non linear amplification in the particle creation is obtained, due to the altogether action of thermal and geometric effects. As a consequence the frequencies in the system look like red shifted with respect to the case where the thermal creation is not taken into account.