Neutrino specific spin-3/2 dark matter

TL;DR

This paper investigates spin-3/2 neutrino-portal dark matter models, analyzing their ability to produce the observed relic density through thermal freeze-out, considering effective field theory and specific models constrained by experimental and cosmological data.

Contribution

It introduces a comprehensive analysis of spin-3/2 dark matter coupled to neutrinos, including effective field theory and two specific neutrino-portal models, with detailed parameter space exploration.

Findings

Relic density can be achieved within certain parameter ranges.

Constraints from neutrino experiments limit model parameters.

Models remain viable under current cosmological bounds.

Abstract

In this paper we consider a spin-$\frac{3}{2}$ dark matter (DM) particle coupled to neutrinos as a viable candidate to produce the observed DM relic density through the thermal freeze-out mechanism. The couplings of DM to neutrinos is considered first in a most general dimension six effective field theory framework. We then consider two specific neutrino-portal models discussed in the literature. In the first model DM couples to the standard model neutrinos through mixing generated by a sterile pseudo-Dirac massive neutrino and the second model we consider is the widely studied $U(1)_{L_\mu - L_\tau}$ gauge symmetric model. For each of these models we explore the parameter space required to generate the observed relic density. The constraints on the parameters of these models from the existing and proposed neutrino experiments as well as from existing cosmological and astrophysical bounds are considered in the context of the relic density calculations.