Nonthermal Axino as Cool Dark Matter in Supersymmetric Standard Model without R-parity

TL;DR

This paper proposes that axinos, as supersymmetric partners of axions, can serve as cool dark matter candidates compatible with neutrino oscillation data, especially in models with R-parity violation.

Contribution

It introduces axinos as viable sterile neutrino-like dark matter candidates within supersymmetric models without R-parity, linking axino properties to neutrino phenomenology.

Findings

Axinos can have the right mass range for dark matter.

Mixing between axinos and active neutrinos can explain neutrino oscillations.

Axino dark matter is compatible with gauge mediated supersymmetry breaking.

Abstract

We point out that the axino predicted as the supersymmetric partner of the axion is a good candidate for the recently proposed sterile neutrino cool dark matter. The axino mass falls into the right range in the context of gauge mediated supersymmetry breaking. A sizable mixing of the axino with active neutrinos arises when R-parity violation is allowed and the resulting neutrino masses and mixing accommodate the atmospheric and solar neutrino oscillations simultaneously.