Abstract
The creation of particles (bosons and fermions) in a hot Friedmann universe from an initial state described by a thermal density matrix is considered in the case when the effective mass of the particles depends on the temperature. It is shown that for scalar particles allowance for the temperature effects leads to a very strong suppression of the creation process. For spinor particles, allowance for the temperature effects leads to a strong suppression of the process of creation from an initial vacuum state. However if the creation of the spinor particles takes place from a state described by a thermal density matrix, then the temperature effect on the particle creation process is relatively weak.
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