# Constraining Sterile Neutrino Cosmology with Terrestrial Oscillation Experiments

## TL;DR

This paper examines how terrestrial neutrino experiments and cosmological data together can constrain sterile neutrino properties, highlighting current tensions and future prospects for resolving them.

## Contribution

It analyzes the complementarity of terrestrial and cosmological measurements in sterile neutrino searches, emphasizing the potential of reactor experiments to surpass cosmological constraints.

## Key findings

- Reactor experiments can probe sterile neutrino parameter space beyond Planck constraints.
- Upcoming accelerator experiments will not significantly improve existing bounds.
- There is a notable tension between cosmological data and reactor antineutrino experiments.

## Abstract

We explore the complementarity between terrestrial neutrino oscillation experiments and astrophysical/cosmological measurements in probing the existence of sterile neutrinos. We find that upcoming accelerator neutrino experiments will not improve on constraints by the time they are operational, but that reactor experiments can already probe parameter space beyond the reach of Planck. We emphasize the tension between cosmological experiments and reactor antineutrino experiments and enumerate several possibilities for resolving this tension.