Casimir effect and Stefan-Boltzmann law at finite temperature in a Friedmann-Robertson-Walker universe

摘要

A spatially flat Friedmann-Robertson-Walker background with a general scale factor is considered. In this spacetime, the energy-momentum tensor of the scalar field with a general curvature coupling parameter is obtained. Using the Thermo Field Dynamics (TFD) formalism, the Stefan-Boltzmann law and the Casimir effect at finite temperature are calculated. The Casimir effect at zero temperature is also considered. The expansion of the universe changes these effects. A discussion of these modifications is presented.