# Superheavy Thermal Dark Matter and Primordial Asymmetries

## TL;DR

This paper explores how late-time entropy injections in the early universe can allow for superheavy thermal dark matter with masses up to 10^{10} GeV, relaxing previous mass bounds and enabling asymmetric dark matter models.

## Contribution

It introduces a framework where late entropy jumps relax the unitarity mass bound, enabling superheavy asymmetric dark matter consistent with Affleck-Dine baryogenesis.

## Key findings

- Relaxes dark matter mass bound to 10^{10} GeV due to entropy injections.
- Demonstrates how Affleck-Dine mechanism can generate baryon and dark matter asymmetries.
- Shows that smaller annihilation cross sections are sufficient for relic density.

## Abstract

The early universe could feature multiple reheating events, leading to jumps in the visible sector entropy density that dilute both particle asymmetries and the number density of frozen-out states. In fact, late time entropy jumps are usually required in models of Affleck-Dine baryogenesis, which typically produces an initial particle-antiparticle asymmetry that is much too large. An important consequence of late time dilution, is that a smaller dark matter annihilation cross section is needed to obtain the observed dark matter relic density. For cosmologies with high scale baryogenesis, followed by radiation-dominated dark matter freeze-out, we show that the perturbative unitarity mass bound on thermal relic dark matter is relaxed to $10^{10}$ GeV. We proceed to study superheavy asymmetric dark matter models, made possible by a sizable entropy injection after dark matter freeze-out, and identify how the Affleck-Dine mechanism would generate the baryon and dark asymmetries.