# Axino warm dark matter and $\Omega_b - \Omega_{DM}$ coincidence

## TL;DR

This paper proposes that axinos produced from leptonic Q-ball decay can serve as warm dark matter, addressing satellite and cusp problems, while also naturally explaining the baryon-dark matter density coincidence.

## Contribution

It introduces a novel scenario where axinos from Q-ball decay act as warm dark matter, linking dark matter properties with baryon asymmetry.

## Key findings

- Axinos can be warm dark matter suitable for small-scale structure problems.
- The scenario naturally explains the coincidence between baryon and dark matter densities.

## Abstract

We show that axinos, which are dominantly generated by the decay of the next-to-lightest supersymmetric particles produced from the leptonic $Q$-ball ($L$-ball), become warm dark matter suitable for the solution of the missing satellite problem and the cusp problem. In addition, $\Omega_b - \Omega_{DM}$ coincidence is naturally explained in this scenario.