Dynamical decompactification from brane gases in eleven-dimensional supergravity

TL;DR

This paper explores how brane gas cosmology within eleven-dimensional supergravity can dynamically explain the emergence of three large spatial dimensions from initial conditions with many unwrapped dimensions, expanding the scope of initial universe scenarios.

Contribution

It introduces new cosmological solutions in eleven-dimensional supergravity that support dynamical decompactification of three dimensions, considering the full bosonic sector.

Findings

New solutions with universal asymptotic scaling behavior

Initial conditions with many unwrapped dimensions are viable

Potential increase in probability of decompactification from anisotropic backgrounds

Abstract

Brane gas cosmology provides a dynamical decompactification mechanism that could account for the number of spacetime dimensions we observe today. In this work we discuss this scenario taking into account the full bosonic sector of eleven-dimensional supergravity. We find new cosmological solutions that can dynamically explain the existence of three large spatial dimensions characterised by an universal asymptotic scaling behaviour and a large number of initially unwrapped dimensions. This type of solutions enlarge the possible initial conditions of the Universe in the Hagedorn phase and consequently can potentially increase the probability of dynamical decompactification from anisotropically wrapped backgrounds.