# On Anomaly-Free Dark Matter Models

## TL;DR

This paper explores anomaly-free gauge theories predicting fermionic dark matter, analyzing their detection signals, gamma-ray signatures, and establishing bounds on symmetry breaking scales based on relic density and perturbative constraints.

## Contribution

It provides a comprehensive study of anomaly-free dark matter models, linking anomaly cancellation to observable gamma-ray signatures and setting bounds on symmetry breaking scales.

## Key findings

- Upper bound on symmetry breaking scale from relic density and perturbative constraints
- Distinct gamma-ray line signatures can be distinguished from continuum spectra
- Full analysis of gamma lines from dark matter annihilation in anomaly-free models

## Abstract

We investigate the predictions of anomaly-free dark matter models for direct and indirect detection experiments. We focus on gauge theories where the existence of a fermionic dark matter candidate is predicted by anomaly cancellation, its mass is defined by the new symmetry breaking scale, and its stability is guaranteed by a remnant symmetry after the breaking of the gauge symmetry. We find an upper bound on the symmetry breaking scale by applying the relic density and perturbative constraints. The anomaly-free property of the theories allows us to perform a full study of the gamma lines from dark matter annihilation. We investigate the correlation between predictions for final radiation processes and gamma lines. Furthermore, we demonstrate that the latter can be distinguished from the continuum gamma ray spectrum.