2001/04/30 by Dharam Vir Ahluwalia, D. V. Ahluwalia
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1142/s0217732301003760
published as Mod.Phys.Lett.A16:917-926,2001 · Published version. A "Note Added" on (a) The reported ambiguity in the context of a two-doublet structure of the 4-neutrino mixing [L. Bento, P. Keränen, J. Maalampi, Phys. Lett. B 476, 205-212 (2000)], and (b) An earlier work - predating the work of Athar et al. - of J. G. Learned and S. Pakvasa [Astropart. Phys. 3, 267-274 (1995)]
openalex publication_date 2001/05/10 · arxiv created 2001/05/28 · arxiv updated 2010/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
For high energy cosmic neutrinos Athar, Jeźabek, and Yasuda (AJY) have recently shown that the existing data on neutrino oscillations suggest that cosmic neutrino flux at the AGN/GRB source, F(ν e ):F(ν μ ):F(ν τ ) ≈ 1:2:0, oscillates to F(ν e ):F(ν μ ):F(ν τ ) ≈ 1:1:1. These results can be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino detectors with a good flavor resolution. Here, we rederive the AJY result from quasi bi-maximal mixing, and show that observation of F(ν e ):F(ν μ ):F(ν τ ) ≈ 1:1:1 does not necessarily establish cosmic neutrino flux at the AGN/GRB source to be F(ν e ):F(ν μ ):F(ν τ ) ≈ 1:2:0. We also note that if the length scale for the quantum-gravity induced decoherence for astrophysical neutrinos is of the order of a Mpc, then independent of the MNS matrix, the Liu–Hu–Ge (LHG) mechanism would lead to flux equalization for the cosmic/astrophysical neutrinos.