High energy neutrino emission and neutrino background from internal shocks of GRBs

Kohta Murase, Shigehiro Nagataki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High energy neutrino emission from GRBs is discussed. In this paper, by using the simulation kit GEANT4, we calculate proton cooling efficiency including pion-multiplicity and proton-inelasticity in photomeson production. First, we estimate the maximum energy of accelerated protons in GRBs. Using the obtained results, neutrino flux from one burst and a diffuse neutrino background are evaluated quantitatively. We also take account of cooling processes of pion and muon, which are crucial for resulting neutrino spectra. We confirm the validity of analytic approximate treatments on GRB fiducial parameter sets, but also find that the effects of multiplicity and high-inelasticity can be important on both proton cooling and resulting spectra in some cases. Finally, assuming that the GRB rate traces the star formation rate, we obtain a diffuse neutrino background spectrum from GRBs for specific parameter sets. We introduce the nonthermal baryon-loading factor, rather than assume that GRBs are main sources of UHECRs. We find that the obtained neutrino background can be comparable with the prediction of Waxman & Bahcall, although our ground in estimation is different from theirs. In this paper, we study on various parameters since there are many parameters in the model. The detection of high energy neutrinos from GRBs will be one of the strong evidences that protons are accelerated to very high energy in GRBs. Furthermore, the observations of a neutrino background has a possibility not only to test the internal shock model of GRBs but also to give us information about parameters in the model and whether GRBs are sources of UHECRs or not.

Original languageEnglish (US)
Title of host publicationSUSY06
Subtitle of host publication14th International Conference on Supersymmetry and the Unification of Fundamental Interactions
Pages630-633
Number of pages4
DOIs
Publication statusPublished - Aug 3 2007
EventSUSY06: 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions - Irvine, CA, United States
Duration: Jun 12 2006Jun 17 2006

Publication series

NameAIP Conference Proceedings
Volume903
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherSUSY06: 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions
CountryUnited States
CityIrvine, CA
Period6/12/066/17/06

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Murase, K., & Nagataki, S. (2007). High energy neutrino emission and neutrino background from internal shocks of GRBs. In SUSY06: 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions (pp. 630-633). (AIP Conference Proceedings; Vol. 903). https://doi.org/10.1063/1.2735263