Axinos as Cold 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.

Figures (1)

• Figure 1: A schematic behavior of the co-moving number density: the thermal equilibrium (thick solid), NLSP neutralino (dash) and LSP axino (thin solid).