# 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021)

26 August 2021 to 3 September 2021

## Time delay distributions of neutrino echoes induced by secret neutrino interactions

2 Sep 2021, 17:10
50m
Talk in parallel session Neutrino physics and astrophysics

### Speaker

Jose Carpio (Penn State University)

### Description

We examine the time delay distribution of astrophysical neutrinos as a result of Beyond Standard Model interactions with the cosmic neutrino background. We focus on the case of neutrino-neutrino interactions with a scalar mediator, and develop a framework to handle the sharp increase in the cross section at resonance energy. For a 10 MeV mediator mass and neutrino mass of 0.1 eV, we find that the neutrino characteristic time delay differs from analytic estimates at large optical depths, both in the elastic and inelastic scattering regimes. As an application of our simulations, we assumed an $E^{-2}$ power law spectrum at $z=1$, and found typical delays of 10s--1000s, for neutrinos above 1 TeV, for coupling strengths between 0.01 and 0.2.

### Primary authors

Jose Carpio (Penn State University) Dr. Kohta Murase (Penn State University)