INVESTIGADORES
GANGUI Alejandro
artículos
Título:
Loss of Coherence in Multidimensional Minisuperspaces
Autor/es:
ALEJANDRO GANGUI; FRANCISCO D. MAZZITELLI; MARIO A. CASTAGNINO
Revista:
PHYSICAL REVIEW D - PARTICLE AND FIELDS
Editorial:
The American Physical Society
Referencias:
Año: 1991 vol. 43 p. 1853 - 1858
ISSN:
1550-7998
Resumen:
In the semiclassical limit of quantum gravity, solutions to the
Wheeler-DeWitt equation involve several WKB components. In order to
reach the adequate classical limit these contributions should not
interfere. We show here that this is in general the case. We work with
a general minisuper-space model with perturbations and we construct the
reduced density matrix ρ̃(gA, gA′) by tracing out all the nonrelevant modes of the environment. It turns out that not only are the off-diagonal terms of ρ̃(gA, gA′) strongly suppressed but the quantum contributions to ρ̃(gA, gA)
due to interference between different semiclassical solutions also
vanish. As an example we discuss the particular case of the
Kantowski-Sachs cosmological model.