# Sterile neutrino dark matter via GeV-scale leptogenesis?

## TL;DR

This paper investigates a scenario where keV to GeV right-handed neutrinos explain neutrino masses, dark matter, and baryon asymmetry, by numerically solving cosmological evolution equations at temperatures up to 5 GeV.

## Contribution

It provides a detailed numerical analysis of sterile neutrino production in a 1+2 flavor framework, including late entropy and lepton asymmetry effects, for the first time at these temperatures.

## Key findings

- Approximately 10% of dark matter abundance can be produced with favorable parameters.
- Late entropy production influences dark matter abundance.
- Potential methods to increase dark matter production are discussed.

## Abstract

It has been proposed that in a part of the parameter space of the Standard Model completed by three generations of keV...GeV right-handed neutrinos, neutrino masses, dark matter, and baryon asymmetry can be accounted for simultaneously. Here we numerically solve the evolution equations describing the cosmology of this scenario in a 1+2 flavour situation at temperatures $T \le 5$ GeV, taking as initial conditions maximal lepton asymmetries produced dynamically at higher temperatures, and accounting for late entropy and lepton asymmetry production as the heavy flavours fall out of equilibrium and decay. For 7 keV dark matter mass and other parameters tuned favourably, $\sim 10\%$ of the observed abundance can be generated. Possibilities for increasing the abundance are enumerated.