Cosmological singlet diagnostics of neutrinophilic dark matter

TL;DR

This paper proposes a neutrinophilic dark sector model where sterile neutrinos connect dark matter and standard model neutrinos, addressing small-scale structure issues while satisfying all current experimental and cosmological constraints.

Contribution

It introduces a novel dark sector model with sterile neutrinos that maintain interactions post-Big Bang nucleosynthesis, solving key cosmological problems.

Findings

Dark sector model compatible with current constraints

Prolonged neutrino-dark matter interactions address structure formation issues

Sterile neutrinos enable effective dark matter-neutrino coupling

Abstract

The standard model of particle physics is extended by adding a purely neutrinophilic dark sector. It is shown that theories which accommodate standard model neutrinos as dark radiation are resurrected. Sterile neutrinos bridge the visible and the dark sector and can keep their mutual interactions effective even after the epoch of big bang nucleosythesis. This prolonged contact between dark matter and standard model neutrinos solves the well-known small-scale structure problems of the cosmological standard model. The dark sector presented in this work satisfies all experimental and observational constraints from particle physics and cosmology.