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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Neutrinos from collapsars

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Vieyro, F. L. [1, 2, 3] ; Romero, G. E. [2, 3] ; Peres, O. L. G. [1, 4]
Total Authors: 3
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[2] Consejo Nacl Invest Cient & Tecn, CCT La Plata, IAR, RA-1894 Buenos Aires, DF - Argentina
[3] Univ Nacl La Plata, Fac Ciencias Astron & Gepfis, RA-1900 La Plata - Argentina
[4] Abdus Salaam Int Ctr Theoret Phys, Abdus Salam Int Ctr Theoret Phys, I-34010 Trieste - Italy
Total Affiliations: 4
Document type: Journal article
Source: Astronomy & Astrophysics; v. 558, OCT 2013.
Web of Science Citations: 3

Context. Long gamma-ray bursts (GRBs) are associated with the gravitational collapse of very massive stars. The central engine of a GRB can collimate relativistic jets that propagate inside the stellar envelope. The shock waves produced when the jet disrupts the stellar surface are capable of accelerating particles up to very high energies. Aims. If the jet has hadronic content, neutrinos will be produced via charged pion decays. The main goal of this work is to estimate the neutrino emission produced in the region close to the surface of the star, taking pion and muon cooling into account, along with subtle effects arising from neutrino production in a highly magnetized medium. Methods. We estimate the maximum energies of the different kinds of particles and solve the coupled transport equations for each species. Once the particle distributions are known, we calculate the intensity of neutrinos. We study the different effects on the neutrinos that can change the relative weight of different flavors. In particular, we consider the effects of neutrino oscillations, and of neutrino spin precession caused by strong magnetic fields. Results. The expected neutrino signals from the shocks in the uncorking regions of Population III events is very weak, but the neutrino signal produced by Wolf-Rayet GRBs with z < 0.5 is not far from the level of the atmospheric background. Conclusions. The IceCube experiment does not have the sensitivity to detect neutrinos from the implosion of the earliest stars, but a number of high-energy neutrinos may be detected from nearby long GRBs. The cumulative signal should be detectable over several years (similar to 10 yr) of integration with the full 86-string configuration. (AU)

FAPESP's process: 12/16389-1 - Neutrino phenomenology
Grantee:Orlando Luis Goulart Peres
Support type: Regular Research Grants