Quantum effects of massless fields in anisotropic spacetime

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Abstract
The authors consider the quantum effects of scalar and spinor fields (particle creation and vacuum polarisation) in an external gravitational field. They think that external anisotropic gravitational fields lead to an infrared cutoff of the created particle spectrum. The value of the infrared cutoff is connected with 'temperature' (or 'entropy') of the anisotropic gravitational field and leads to exclusion of the vacuum polarisation and conformal anomaly (in the massless limit). The energy density of created particles are calculated as a function of the gravitational temperature.