Semiclassical suppression of weak anisotropies of a generic Universe

TL;DR

This paper develops a semiclassical approach to suppress weak anisotropies in a generic universe, showing how the universe evolves towards isotropy as it expands, with a probabilistic wave function consistent with Copenhagen interpretation.

Contribution

It introduces a semiclassical wave function model that describes anisotropy suppression in inhomogeneous cosmologies, linking quantum behavior with classical isotropic expansion.

Findings

Wave function describes anisotropy evolution with respect to the scale factor

Near singularity, anisotropies are widely spread

At large expansion, the universe favors isotropic states

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.