Semiclassical suppression of weak anisotropies of a generic Universe

¹  ICRA - International Center for Relativistic Astrophysics, Dipartimento di Fisica, Università di Roma “Sapienza” P.le A. Moro 5, 00185 Rome, Italy, EU
²  Centre de Physique Théorique de Luminy, Université de la Méditerranée - F-13288 Marseille, France, EU
³  Dipartimento di Fisica (G9), Università di Roma “Sapienza” - P.le A. Moro 5, 00185 Rome, Italy, EU
⁴  ENEA C.R. Frascati (Dipartimento FPN) - Via E. Fermi 45, 00044 Frascati, Rome, Italy, EU
⁵  ICRANET C.C. Pescara - P.le della Repubblica 10, 65100 Pescara, Italy, EU

Corresponding authors: battisti@icra.it riccardo.belvedere@icra.it montani@icra.it

Received: 20 May 2009
Accepted: 28 May 2009

Abstract

A semiclassical mechanism which suppresses the weak anisotropies of an inhomogeneous cosmological model is developed. In particular, a wave function of this Universe having a meaningful probabilistic interpretation is obtained that is in agreement with the Copenhagen School. It describes the evolution of the anisotropies with respect to the isotropic scale factor which is regarded as a semiclassical variable playing an observer-like role. Near the cosmological singularity the solution spreads over all values of the anisotropies while, when the Universe expands sufficiently, the closed Friedmann-Robertson-Walker model appears to be the favorite state.