Neutrino Oscillations within the Induced Gravitational Collapse Paradigm of Long Gamma-Ray Bursts

Author(s)

Becerra, L. ^{[1, 2, 3]} ; Guzzo, M. M. ^[4] ; Rossi-Torres, F. ^[4] ; Rueda, J. A. ^{[1, 2, 3, 5]} ; Ruffini, R. ^{[1, 2, 3, 5]} ; Uribe, J. D. ^{[1, 2, 3]}

Affiliation

^[1] Sapienza Univ Roma, Dipartimento Fis, Ple Aldo Moro 5, I-00185 Rome - Italy

^[2] Sapienza Univ Roma, ICRA, Ple Aldo Moro 5, I-00185 Rome - Italy

^[3] ICRANet, Pzza Repubbl 10, I-65122 Pescara - Italy

^[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Rua Sergio Buarque Holanda 777, BR-13083859 Campinas, SP - Brazil

^[5] Ctr Brasileiro Pesquisas Fis, ICRANet Rio, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro - Brazil

• Document type: Journal article
• Source: ASTROPHYSICAL JOURNAL; v. 852, n. 2 JAN 10 2018.
• Web of Science Citations: 7

Abstract

The induced gravitational collapse paradigm of long gamma-ray bursts associated with supernovae (SNe) predicts a copious neutrino-antineutrino (nu(nu) over bar) emission owing to the hypercritical accretion process of SN ejecta onto a neutron star (NS) binary companion. The neutrino emission can reach luminosities of up to 10(57) MeV. s(-1), mean neutrino energies of 20 MeV, and neutrino densities of 10(31) cm(-3). Along their path from the vicinity of the NS surface outward, such neutrinos experience flavor transformations dictated by the neutrino-to-electron-density ratio. We determine the neutrino and electron on the accretion zone and use them to compute the neutrino flavor evolution. For normal and inverted neutrino mass hierarchies and within the two-flavor formalism (nu(e)nu(x)), we estimate the final electronic and nonelectronic neutrino content after two oscillation processes: (1) neutrino collective effects due to neutrino self-interactions where the neutrino density dominates, and (2) the Mikheyev-Smirnov-Wolfenstein effect, where the electron density dominates. We find that the final neutrino content is composed by similar to 55% (similar to 62%) of electronic neutrinos, i.e., nu(e) + (nu) over bar (e), for the normal (inverted) neutrino mass hierarchy. The results of this work are the first step toward the characterization of a novel source of astrophysical MeV neutrinos in addition to core-collapse SNe and, as such, deserve further attention. (AU)

• FAPESP's process: 16/00799-7 - Neutrino physics and astrophysics: probing the fundamentals of physics through neutrinos
• Grantee: Marcelo Moraes Guzzo
• Support Opportunities: Scholarships abroad - Research