# Cosmic neutrino background search experiments as decaying dark matter detectors

## TL;DR

This paper explores how long-lived dark matter particles decaying into eV-scale neutrinos could be detected by cosmic neutrino background experiments like PTOLEMY, considering current cosmological constraints.

## Contribution

It proposes a simple decay model linking dark matter to detectable neutrino signals at PTOLEMY-like experiments, analyzing potential signatures under existing constraints.

## Key findings

- Decaying dark matter can produce neutrinos detectable by PTOLEMY-like experiments.
- Current cosmological constraints limit the decay parameters and observable signatures.
- The model identifies specific experimental signatures for future detection efforts.

## Abstract

We investigate the possibility that particles that are long-lived on cosmological scales, making up part or all of the dark matter, decay to neutrinos that have present-day energies around an eV. The neutrinos from these decays can potentially be visible at experiments that hope to directly observe the cosmic neutrino background through neutrino capture on tritium, such as PTOLEMY. In the context of a simple model that can realize such decays, we discuss the allowed signatures at a PTOLEMY-like experiment given current cosmological constraints.