Renormalized Stress Tensor for trans-Planckian Cosmology

LOPEZ NACIR, DIANA; MAZZITELLI, F.D.; SIMEONE, CLAUDIO

PHYSICAL REVIEW D - PARTICLE AND FILDS

APS

Lugar: New York; Año: 2005 vol. 72 p. 124013 - 124019

0556-2821

 Finite expressions for the mean value of the stress tensor corresponding to a scalar field with a generalized dispersion relation in a Friedman--Robertson--Walker universe are obtained using adiabatic renormalization. Formally divergent integrals are evaluated by means of dimensional regularization. The renormalization procedure is shown to be equivalent to a redefinition of the cosmological constant and the Newton constant in the semiclassical Einstein equations.