# Signatures of Synchrotron Radiation from the Annihilation of Dark Matter at the Galactic Centre

## TL;DR

This paper introduces a fermionic dark matter model with pseudoscalar interactions, constrains it with experimental data, and explores its potential synchrotron radiation signatures from the Galactic Centre detectable by radio telescopes.

## Contribution

The paper develops a new fermionic dark matter model with pseudoscalar interactions and analyzes its observable synchrotron signals in the Galactic Centre region.

## Key findings

- Model satisfies vacuum stability, perturbativity, LHC, and PLANCK constraints.
- Predicted synchrotron flux densities are within detection capabilities of SKA and GMRT.
- Low frequency radio telescopes could detect signals if operating at predicted peak frequencies.

## Abstract

We propose a fermionic dark matter model by extending Standard Model with a Dirac fermion and a real pseudoscalar. The fermion dark matter particle interacts with the Standard Model sector via the Higgs portal through a dimension five interaction term as also through a pseudoscalar interaction term. The parameter space of the model is then constrained by using the vacuum stability and perturbativity condition as also with the LHC constraints. They are finally constrained by the PLANCK results for dark matter relic densities. The direct detection limits are then ensured to have satisfied by the model. We then explore within the framework of the model, the possible signatures of synchrotron radiation from the annihilations of dark matter in the Galactic Centre region when the end product is $e^+e^-$. We consider the observational data from the radio telescopes namely SKA, GMRT and Jodrell Bank telescopes and compare our calculated synchrotron flux density with them and also with the results predicted by these experiments. We predict that if the low frequency radio telescopes like GMRT, SKA operate at the peak frequencies obtained from our calculations should get a better r.m.s sensitivity.