# Implications of Mixed Axion-Neutralino Dark Matter

## TL;DR

This paper discusses the implications of a mixed axion-neutralino dark matter model, addressing recent experimental constraints and the naturalness of supersymmetric theories.

## Contribution

It explores the viability and phenomenological implications of combining axions and neutralinos as dark matter candidates in light of recent experimental results.

## Key findings

- Neutralino alone cannot account for dark matter without fine-tuning.
- Mixed axion-neutralino models can naturally explain dark matter abundance.
- Implications for SUSY models and naturalness are discussed.

## Abstract

The lack of evidence for weak scale supersymmetry from LHC Run-I and Run-II results along with null results from direct/indirect dark matter detection experiment have caused a paradigm shift in expected phenomenology of SUSY models. The SUSY dark matter candidate, neutralino $\widetilde{Z}_1$, can only satisfy the measured dark matter abundance due to resonance- and co-annihilations in cMSSM model. Moreover, viable parameter space is highly fine-tuned in the cMSSM. In models that can still satisfy the naturalness condition such as NUHM2, the neutralino is underproduced due to its higgsino nature. Neutralino combined with axion that solves the strong CP problem can explain the observed dark matter in the universe. Here I briefly discuss implications of the mixed axion-neutralino scenario.