Cosmological Implications of High-Energy Neutrino Emission from the Decay of Long-Lived Particle

Understand

We study cosmological scenarios in which high-energy neutrinos are emitted from the decay of long-lived massive particles at the cosmic time later than a redshift of 10^6.

• The high-energy neutrino events recently observed by the IceCube experiment suggest a new source of high-energy cosmic-ray neutrinos; decay of a heavy particle can be one of the possibilities.
• We calculate the spectrum of the high-energy neutrinos emitted from the decay of long-lived particles, taking account of the neutrino scattering processes with background neutrinos.
• Then, we derive bounds on the scenario using the observation of high-energy cosmic-ray neutrino flux.