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In the framework of inflationary cosmology I study some aspects ofnonequilibrium thermodynamics for the matter field fluctuations. Thethermodynamic analysis is developed for de Sitter and power - law expansions ofthe universe. In both cases, I find that the heat capacity is negative leadingrespectively, to exponential and superexponential growth for the number ofstates in the infrared sector for de Sitter and power-law expansions of theuniverse. The spectrum for the matter field fluctuations can be understood fromthe background effective temperature when the horizon entry.Comment: Accepted for publication in Phys. Rev.

Inflation and nonequilibrium thermodynamics for the fluctuations in the infrared sector