INVESTIGADORES
CALZETTA Esteban Adolfo
artículos
Título:
Anisotropy dissipation in quantum cosmology
Autor/es:
ESTEBAN CALZETTA
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
APS
Referencias:
Año: 1991 vol. 43 p. 2498 - 2509
ISSN:
0556-2821
Resumen:
We study the issue of decoherence and dissipation in the wave function
of the Universe for a Bianchi type-I universe with classical and quantum
matter. We obtain a coarse-grained description by tracing over the
matter degrees of freedom. Provided that for small universes the wave
function of the universe is concentrated on a neighborhood of the
isotropic configuration, then the coarse-grained density matrix of the
universe will show an even more marked peak around isotropy for large
universes. In this sense we can say that, while decoherence makes the
reduced density matrix of the universe diagonal, dissipation causes the
universe to be isotropic with a high probability for large radii.
