Finite temperature applications in G\"odel space-time

Temperature effects in a scalar field non-minimally coupled to gravity are investigated. The Thermo Field Dynamics formalism is used. This is a topological field theory that allows us to calculate different effects, such as the Stefan-Boltzmann law and the Casimir effect, on an equal footing. These phenomena are calculated assuming the G"odel space-time as a gravitational background. A possible implication of these results at the beginning of the universe is discussed.