Cosmic Initial Conditions for a Habitable Universe

TL;DR

This paper explores the initial conditions necessary for a universe to be habitable within an eternal inflation framework, emphasizing the importance of matter asymmetry and inflationary bounds for life-supporting structures.

Contribution

It extends the analysis of initial universe conditions to include matter asymmetry and provides bounds on inflation for habitability, linking cosmology with life's emergence.

Findings

An anthropic lower bound of ~60 e-folds for inflation is necessary for structure formation.

The probability of a habitable universe depends on dark matter and baryonic matter asymmetry.

Baryonic matter constraints limit the amount of matter available for life-supporting structures.

Abstract

Within the framework of an eternal inflationary scenario, a natural question regarding the production of eternal bubbles is the essential condition requires to have a universe capable of generating life. In either an open or a closed universe, we find an anthropic lower bound on the amount of e-folding in the order of $60$ for the inflationary epoch, which results in the formation of large-scale structures in both linear and non-linear regimes. We extend the question of the initial condition of the universe to the sufficient condition in which we have enough initial dark matter and baryonic matter asymmetry in the early universe for the formation of galactic halos, stars, planets and consequently life. We show that the probability of a habitable universe is proportional to the asymmetry of dark matter and baryonic matter, while the cosmic budget of baryonic matter is limited by the astrophysical constrains.