# On Axion Reheating in the String Landscape

## TL;DR

This paper explores how asymmetric reheating occurs naturally in string compactifications with many axions, potentially solving cosmological issues by preventing uniform reheating of dark sectors.

## Contribution

It demonstrates that asymmetric reheating is common in string models with multiple axions, providing detailed coupling distributions and insights into gauge group preferences.

## Key findings

- Asymmetric reheating arises in large ensembles of string compactifications.
- Reheating couplings are typically very small for most gauge sectors.
- Local string geometry influences the ratios of reheating couplings and gauge group selection.

## Abstract

We demonstrate that asymmetric reheating arises in a large ensemble of string compactifications with many axions and gauged dark sectors. This phenomenon may help avoid numerous cosmological problems that may arise if the sectors were reheated democratically. Distributions of couplings are presented for two classes of axion reheatons, both of which exhibit very small couplings to most of the gauge sectors. In one class, ratios of reheating couplings and also preferred gauge groups are frequently determined by local regions in the string geometry.