Axinos as Cold Dark Matter

TL;DR

This paper proposes that axinos, produced from neutralino decay in the early Universe, are a natural and potentially dominant candidate for cold dark matter, with relic densities comparable to the critical density.

Contribution

It introduces axinos as a viable cold dark matter candidate produced via neutralino decay, highlighting their potential to account for the Universe's missing mass.

Findings

Axinos can be produced in the early Universe through neutralino decay.

Relic density of axinos can match the critical density of the Universe.

Axinos may constitute the main component of dark matter.

Abstract

We show that axinos produced in the early Universe in the decay of the lightest neutralinos are a natural candidate for cold dark matter. We argue that axinos may well provide the main component of the missing mass in the Universe because their relic density is often comparable with the critical density.