Neutrino oscillations and decoherence in short-GRB progenitors

Abstract

Neutrinos are produced in cosmic accelerators, like active galactic nuclei (AGNs), blazars, supernova (SN) remnants and gamma-ray bursts (GRBs). On their way to the Earth they experience flavor-oscillations. The interactions of the neutrinos coming from the source with other particles, e.g. intergalactic primordial neutrinos or heavy-mass right-handed neutrinos, in their way to the detector may transform the original wave packet in pointer states. This phenomenon, known as decoherence, becomes important in the reconstruction of processes at the source. In this work we study neutrino emission in short GRBs by adopting the Fireshell Model. We consider $e^{-}{e}^{+}$-pair annihilation as the main channel for neutrino production. We compare the properties of the neutrino-flux with the characteristic photon-signal produced once the transparency condition is reached. We study the effects of flavor-oscillations and decoherence as neutrinos travel from the region near the black-hole (BH) event-horizon outwards. We consider the source to be in thermal equilibrium, and calculate energy distribution functions for electrons and neutrinos. To compute the effects of decoherence we use a Gaussian model. In this scenario the emitted electron-neutrinos transform into pointer states consisting of $67.8\%$ electron-neutrinos and $32.2\%$ as a combination of mu and tau neutrinos. We found that decoherence plays an important role in the evolution of the neutrino wave packet, leading to the detected pointer states on Earth.

arXiv comment8 pages, 6 figures, 23 references

References in corpus (12)

• Gamma-Ray Bursts and the Fireball Model
• Gamma-Ray Bursts as the Death Throes of Massive Binary Stars
• Short-Duration Gamma-Ray Bursts
• IceCube: An Instrument for Neutrino Astronomy
• On a possible GRB-supernova time sequence
• Decoherence and oscillations of supernova neutrinos
• Towards High-Energy Neutrino Astronomy. A Historical Review
• Neutrino Oscillations Within the Induced Gravitational Collapse Paradigm of Long Gamma-Ray Bursts
• GRB 090510: a genuine short-GRB from a binary neutron star coalescing into a Kerr-Newman black hole
• Supernova Neutrino Detection with IceCube
• Gravitational Waves versus X and Gamma Ray Emission in a Short Gamma-Ray Burst
• The "Fireshell" model in the Swift era

Cited by in corpus (3)

• Studying the neutrino wave-packet effects at medium-baseline reactor neutrino oscillation experiments and the potential benefits of an extra detector
• Extragalactic neutrinos as tracers of Dark Matter?
• Dark matter, supernova neutrinos and other backgrounds in direct dark matter searches. The ANDES laboratory prospects