# Slightly Ultra-violet Freeze-in a Hidden Gluonic Sector

## TL;DR

This paper proposes a mechanism involving higher dimensional operators to produce a viable dark glueball dark matter candidate with a wide mass range, addressing over-density issues and potential cosmic ray signals.

## Contribution

It introduces higher dimensional operators coupling the dark gauge sector to the Standard Model, naturally generating the necessary temperature hierarchy for dark glueballs to be viable dark matter.

## Key findings

- Dark glueballs can be viable dark matter over a wide mass range.
- Operators enable decay channels, potentially observable in cosmic rays.
- The model addresses over-density issues in dark glueball scenarios.

## Abstract

The dark glueball (DGB) from a hidden Yang-Mills sector is a simple non-WIMP dark matter candidate characterized by very few parameters. However, it suffers the over dense issue. To overcome it, in general the dark sector is required to be hierarchically cooler than the visible sector. To naturally generate the desired hierarchy, in this paper we introduce higher dimensional operators coupling the dark gauge field strength tensor to the standard model (SM) Higgs doublets or gauge field strength tensors. By tracking the different phases of the universe from the end of inflation, prethermalization, reheating to the radiation dominance era, we show that these operators can make the DGB be a viable dark matter candidate over a wide mass region, from the sub-GeV to multi-PeV or even beyond. At the same time, these operators open decay channels of DGB to the SM species, and partial of the parameter space could leave hints in the cosmic ray.