Boundary divergences in vacuum self-energies and quantum field theory in curved spacetime

F.D. MAZZITELLI; J.P. NERY; A. SATZ

PHYSICAL REVIEW D - PARTICLE AND FILDS

APS

Lugar: New York; Año: 2011 vol. 84 p. 125008 - 125017

0556-2821

It is well known that boundary conditions on quantum fields produce divergences in the renormalized energy-momentum tensor near the boundaries. Although irrelevant for the computation of Casimir forces between different bodies, the self-energy couples to gravity, and the divergences may, in principle, generate large gravitational effects. We present an analysis of the problem in the context of quantum field theory in curved spaces. Our model consists of a quantum scalar field coupled to a classical field that, in a certain limit, imposes Dirichlet boundary conditions on the quantum field. We show that the model is renormalizable and that the divergences in the renormalized energy-momentum tensor disappear for sufficiently smooth interfaces.