Conditions for spontaneous homogenization of the Universe

TL;DR

This paper investigates whether the early Universe could have become homogeneous through natural dynamical processes, challenging previous beliefs that such homogenization requires highly specific initial conditions.

Contribution

It demonstrates that the set of initial conditions leading to spontaneous homogenization has a non-zero measure, contrary to prior assumptions of measure zero.

Findings

Initial conditions for homogenization can form a set of non-zero measure.

Dynamical processes may naturally lead to a homogeneous Universe.

Challenges the view that homogenization requires fine-tuned initial states.

Abstract

The present-day Universe appears to be homogeneous on very large scales. Yet when the casual structure of the early Universe is considered, it becomes apparent that the early Universe must have been highly inhomogeneous. The current paradigm attempts to answer this problem by postulating the inflation mechanism However, inflation in order to start requires a homogeneous patch of at least the horizon size. This paper examines if dynamical processes of the early Universe could lead to homogenization. In the past similar studies seem to imply that the set of initial conditions that leads to homogenization is of measure zero. This essay proves contrary: a set of initial conditions for spontaneous homogenization of cosmological models can form a set of non-zero measure.