منابع مشابه
Relic Neutrinos: Neutrino Properties from Cosmology
After a short introduction on the predicted cosmic neutrino background in the universe, we review some of the cosmological bounds related to neutrinos. In particular we show how the recent data on the anisotropies of the cosmic microwave background radiation from the WMAP satellite, combined with other experimental results, can constrain the radiation content of the universal energy density and...
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We derive constraints on the relic abundance of a generic particle of mass ∼ 1 − 1014 TeV which decays into neutrinos at cosmological epochs, using data from the Fréjus and IMB nucleon decay detectors and the Fly’s Eye air shower array. The lifetime of such unstable particles which may constitute the dark matter today is bounded to be greater than ∼ 1014 − 1018 yr, depending on the mass. For li...
متن کاملRelic neutrino background from cosmological supernovae
Present and future observations of supernova relic neutrinos (SRNs), i.e., a cosmological neutrino background from past core-collapse supernova explosions, potentially give us useful information concerning various fields of astrophysics, cosmology and particle physics. We review recent progress of theoretical and observational studies of SRNs, particularly focusing on the detectability and also...
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A large class of string-cosmology backgrounds leads to a spectrum of relic stochastic gravitational waves, strongly tilted towards high frequencies, and characterized by two basic parameters of the cosmological model. We estimate the required sensitivity for detection of the predicted gravitational radiation and show that a region of our parameter space is within reach for some of the planned g...
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The exact Quantum Kinetic Equations for a two-flavour active-sterile neutrino system are used to provide a systematic derivation of approximate evolution equations for the relic neutrino asymmetry. An extension of the adiabatic approximation for matter-affected neutrino oscillations is developed which incorporates decoherence due to collisions. Exact and approximate expressions for the decohere...
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ژورنال
عنوان ژورنال: The Antiquaries Journal
سال: 1922
ISSN: 0003-5815,1758-5309
DOI: 10.1017/s0003581500089575