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We calculate the total internal energy, total energy density and pressure,and the free energy for the neutrino and electromagnetic fields in Einstein andclosed Friedmann cosmological models. The Casimir contributions to all thesequantities are separated. The asymptotic expressions for both the totalinternal energy and free energy, and for the Casimir contributions to them arefound in the limiting cases of low and high temperatures. It is shown that theneutrino field does not possess a classical limit at high temperature. As forthe electromagnetic field, we demonstrate that the total internal energy hasthe classical contribution and the Casimir internal energy goes to theclassical limit at high temperature. The respective Casimir free energycontains both linear and logarithmic terms with respect to the temperature. Thetotal and Casimir entropies for the neutrino and electromagnetic fields at lowtemperature are also calculated and shown to be in agreement with the Nernstheat theorem.

Thermal Casimir effect for neutrino and electromagnetic fields in closed Friedmann cosmological model