Black Hole Accretion Disk Diffuse Neutrino Background

TL;DR

This paper estimates the cosmic MeV neutrino background from accretion disks in collapsars and mergers, suggesting detectable signals at HyperK that could reveal the history of such cosmic events.

Contribution

It provides updated estimates and detection rates for relic neutrinos from collapsars and mergers, highlighting their potential contribution to the cosmic neutrino background.

Findings

Relic neutrinos from collapsars could significantly contribute to the cosmic background.

HyperK may detect neutrinos from binary neutron-star mergers.

Uncertainty in collapsar rates affects the predicted neutrino background.

Abstract

We study the cosmic MeV neutrino background from accretion disks formed during collapsars and the coalescence of compact-object mergers. We provide updated estimates, including detection rates, of relic neutrinos from collapsars, as well as estimates for neutrinos that are produced in mergers. Our results show that diffuse neutrinos detected at HyperK would likely include some that were emitted from binary neutron-star mergers. The collapsar rate is uncertain, but at its upper limit relic neutrinos from these sources would provide a significant contribution to the Cosmic Diffuse Neutrino Background.