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Both Stefan-Boltzmann law and the Casimir effect, in a universe described bythe FRW metric with zero curvature, are calculated. These effects are describedby Thermo Field Dynamics (TFD). The gravitational energy-momentum tensor isdefined in the context of Teleparallel Equivalent to General Relativity (TEGR).Each of the two effects gives a consistent prediction with what is observed ona cosmological scale. One of the effect establishes a minimum range for thedeceleration parameter. While another leads to the conclusion that a possiblecosmological constant has a very small order of magnitude.

On Gravitational Stefan-Boltzmann Law and Casimir Effect in FRW Universe