Abstract
AbstractQuantum theory of quantized scalar and spinor fields in homogeneous isotropic space‐time is considered. Particle interpretation of quantized field is given which is based on diagonalization of the Hamiltonian constructed by means of the metrical stress‐energy tensor (SET). This interpretation allows to define a normal ordering prescript which respects the conservation property of SET. With the help of Zeldovich‐Starobinsky regularization procedure [3] this allows to obtain the total renormalized vacuum expectation values of SET which include both nonlocal terms corresponding to the particle creation and local ones describing the vacuum polarization. Estimates for the total SET of scalar and spinor field on various stages of the evolution for realistic cosmological models are obtained. Also the effect of spontaneous breakdown of gauge symmetry for selfinteracting scalar field in a hyperbolic Friedman model is considered.
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