Galilean Islands in Eternally Inflating Background

TL;DR

This paper proposes a model where our universe emerges from a low-energy de Sitter background through a Galilean genesis phase, leading to a multiverse of island universes within eternal inflation.

Contribution

It introduces a novel scenario combining Galilean genesis with eternal inflation, explaining how island universes can form from a low-energy de Sitter background.

Findings

Universe can emerge classically from low-energy de Sitter space.

Some regions undergo Galilean genesis, forming island universes.

Eternal inflation persists in other regions, allowing multiple island universes.

Abstract

We show that the observational universe may emerge classically from a de Sitter background with low energy scale. We find, after calculating the curvature perturbation, that the resulting scenario is actually a style of the eternal inflation scenario, in which some regions will go through the slowly expanding Galilean genesis phase with the rapidly increasing energy density and become island universes, while other regions are still eternally inflating, which will make the room for more island universes to emerge.