Energy dependent neutrino flavor ratios from cosmic accelerators on the Hillas plot
نویسندگان
چکیده
منابع مشابه
Cosmic Neutrino Flavor Democracy and Unitarity Violation at Neutrino Telescopes
Provided ultrahigh-energy cosmic neutrinos are produced from the decays of charged pions arising from pp and (or) pγ collisions, their flavor ratios at a neutrino telescope will be φTe : φ T μ : φ T τ ≈ 1 : 1 : 1. We show that the exact flavor democracy can occur if the unitary neutrino mixing matrix satisfies either θ13 = 0 and θ23 = π/4 (CP invariance) or δ = ±π/2 and θ23 = π/4 (CP violation)...
متن کاملPhysical conditions in potential sources of ultra - high - energy cosmic rays . I . Updated Hillas plot and radiation - loss constraints
We review basic constraints on the acceleration of ultra-high-energy cosmic rays (UHECRs) in astrophysical sources, namely the geometrical (Hillas) criterion and restrictions from radiation losses in different acceleration regimes. Using the latest available astrophysical data, we redraw the Hillas plot and figure out potential UHECR accelerators. For the acceleration in central engines of acti...
متن کاملConstraints on Flavor-dependent Long Range Forces from Neutrino Experiments
We study the impact of flavor-dependent long range leptonic forces mediated by the Le − Lμ or Le −Lτ gauge bosons on the solar neutrino oscillations, when the interaction range RLR is much larger than the Earth-Sun distance. The solar and atmospheric neutrino mass scales do not get trivially decoupled in this situation even if θ13 is vanishingly small. In addition, for α ∼ > 10 and normal hiera...
متن کاملEffects of neutrino mixing on high-energy cosmic neutrino flux
Several cosmologically distant astrophysical sources may produce high-energy cosmic neutrinos (E ≥ 10 GeV) of all flavors above the atmospheric neutrino background. We study the effects of vacuum neutrino mixing in three flavor framework on this cosmic neutrino flux. We also consider the effects of possible mixing between the three active neutrinos and the (fourth) sterile neutrino with or with...
متن کاملUltra High Energy Cosmic Ray Accelerators
The surprising lack of a high energy cutoff in the cosmic ray spectrum at the highest energies together with an apparently isotropic distribution of arrival directions have strongly challenged most models proposed for the acceleration of ultra high energy cosmic rays. Young neutron star winds may be able to explain the mystery. We discuss this recent proposal after summarizing the observational...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astroparticle Physics
سال: 2010
ISSN: 0927-6505
DOI: 10.1016/j.astropartphys.2010.07.003