# Super heavy thermal dark matter

## TL;DR

This paper introduces a novel mechanism for super heavy thermal dark matter with masses up to 10^{14} GeV, maintaining equilibrium through a chain of nearly degenerate particles interacting with the Standard Model, and explores its cosmological and experimental implications.

## Contribution

It presents a new model for super heavy thermal dark matter that avoids unitarity bounds and involves a chain of nearly degenerate particles maintaining equilibrium.

## Key findings

- Dark matter can have masses up to 10^{14} GeV within this framework.
- The model predicts heavy relics decaying at different cosmological epochs.
- Implications for CMB, structure formation, and cosmic ray experiments are discussed.

## Abstract

We propose a mechanism of elementary thermal dark matter with mass up to $10^{14}$ GeV, within a standard cosmological history, whose relic abundance is determined solely by its interactions with the Standard Model, without violating the perturbative unitarity bound. The dark matter consists of many nearly degenerate particles which scatter with the Standard Model bath in a nearest-neighbor chain, and maintain chemical equilibrium with the Standard Model bath by in-equilibrium decays and inverse decays. The phenomenology includes super heavy elementary dark matter and heavy relics that decay at various epochs in the cosmological history, with implications for CMB, structure formation and cosmic ray experiments.