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The nondetection of neutrinos coming from Gamma Ray Bursts (GRBs) by theIceCube experiment has raised serious questions on our understanding of GRB'sand the mechanism of neutrino flux production in them. Motivated by this andthe need for a precise calculation for GRB neutrino flux, here we study theeffects of beyond standard model physics on the GRB neutrino flux. In theinternal shock model of GRB, high energy neutrinos are expected from muon, pionand kaon decays. Using the latest best fit neutrino oscillation parameters, wecompute the expected flux on earth for standard as well as non-standardoscillation scenarios. Among the non-standard scenarios, we consider neutrinodecay, pseudo-dirac nature of neutrinos and presence of one eV scale lightsterile neutrino. Incorporating other experimental bounds on these new physicsscenarios, we show that neutrino decay scenario can significantly alter theneutrino flux on earth from the expected ones whereas the corresponding changesfor pseudo-dirac and sterile neutrino cases are moderate.

Effects of Beyond Standard Model Physics on GRB Neutrinos