# Constraining dark matter-neutrino interactions with IceCube-170922A

## TL;DR

This paper uses the observation of a high-energy neutrino by IceCube to set upper bounds on the interaction cross-section between dark matter and neutrinos, constraining related theoretical models.

## Contribution

It provides the first robust upper bound on dark matter-neutrino interactions at TeV energies using astrophysical neutrino data.

## Key findings

- Upper bound on dark matter-neutrino cross-section: $\sigma /M_{dm} \, \lesssim \, 5.1\times 10^{-23}$ cm$^2$/GeV
- Constraints from CMB and LSS complement neutrino observations to limit interaction models
- Implications for dark matter models with neutrino interactions at high energies

## Abstract

Astrophysical neutrinos travel long distances from their sources to the Earth traversing dark matter halos of clusters of galaxies and that of our own Milky Way. The interaction of neutrinos with dark matter may affect the flux of neutrinos. The recent multi-messenger observation of a high energy neutrino, IceCube-170922A, can give a robust upper bound $\sigma /M_{dm} \lesssim 5.1\times 10^{-23} {\rm cm}^2 /$GeV on the interaction between neutrino and dark matter at a neutrino energy of 290 TeV allowing 90\% suppression. Combining the constraints from CMB and LSS at different neutrino energies, we can constrain models of dark matter-neutrino interactions.