Cosmological constraints from extra-dimension induced domain walls

TL;DR

This paper investigates the cosmological implications of domain walls induced by TeV-scale extra dimensions, using 5D lattice simulations to analyze symmetry restoration and constraints from cosmic microwave background observations.

Contribution

It provides the first non-perturbative lattice simulation analysis of symmetry restoration and domain wall formation in models with extra dimensions.

Findings

Identification of a cut-off in the fifth dimension.

Evidence of symmetry restoration through lattice simulations.

Constraints on reheating temperature to avoid domain wall issues.

Abstract

TeV size extra dimensions introduce domain walls. Such walls are inconsistent with CMB anisotropies. Either inflationary dynamics washes them out, or the reheating temperature is lower then the temperature at which the walls start forming networks. As the restoration of the symmetry is non-perturbative we have performed 5d lattice simulations which show the occurrence of a cut-off in the fifth dimension as well as symmetry restoration.