Estimation of Baryon Asymmetry from Dark Matter Decaying into IceCube Neutrinos

TL;DR

This paper investigates whether decaying heavy dark matter can explain IceCube's high-energy neutrino excess and estimates the resulting baryon asymmetry in the universe.

Contribution

It introduces a model linking dark matter decay to IceCube neutrino observations and estimates the associated baryon asymmetry.

Findings

Dark matter decay can account for PeV neutrino flux.

Estimated dark matter mass > 10^6 GeV and specific lifetime.

Baryon asymmetry produced aligns with observed values.

Abstract

The recent results of IceCube Neutrino Observatory include an excess of PeV neutrino events which appear to follow a broken power law different from the other lower energy neutrinos detected by IceCube. The possible astrophysical source of these neutrinos is still unknown. One possible source of such neutrinos could be the decay of non-thermal, long-living heavy mass Dark Matter, whose mass should be $> 10^{6} \rm {GeV}$ and could have produced at the very early Universe. They can undergo cascading decay via both hadronic and leptonic channels to finally produce such high energy neutrinos. This possibility has been explored in this work by studying the decay flux of these Dark Matter candidates. The mass and lifetime of such Dark Matter particles have been obtained by performing a $\chi^2$ fit with the PeV neutrino data of IceCube. We finally estimate the baryon asymmetry produced in the Universe due to such Dark Matter decay.