Neutrinos and Primordial Nucleosynthesis
نویسندگان
چکیده
منابع مشابه
Neutrinos and Primordial Nucleosynthesis
The importance of the Big Bang Nucleosynthesis (BBN) as a unique tool for studying neutrino properties is discussed, and the recent steps towards a self-consistent and robust handling of the weak reaction decoupling from the thermal bath as well as of the neutrino reheating following the e − e− annihilation are summarized. We also emphasize the important role of the Cosmic Microwave Background ...
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In this contribution we report on a combined analysis of the dependence of CMBR anisotropies and BBN on the energy fractions ΩBh 2 and Ωνh 2 = NνΩ 0 νh 2 for massless neutrinos (Nν standing for the effective neutrino number and Ωνh 2 for the energy contribution of a single ν− ν specie). This is aimed to test the standard and degenerate BBN scenario, using the recent results of the BOOMERanG [1]...
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We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of ντ annihilations into Majorons, present in a wide class of particle physics models of neutrino mass. We display these cosmological limits as functions ofmντ and the ντ -ντ -Majoron coupling g. We show that for theoretically plausible g values ∼ 10 present nucleosynthesis observation...
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The impact of unstable Majorana ντ on primordial nucleosynthesis is considered. The mass and lifetime of ντ are taken in the intervals 0.1-20 MeV and 0.001-400 sec respectively. The studied decay modes are ντ → νμ + φ and ντ → νe + φ, where φ is a massless (or light) scalar. Integro-differential kinetic equations are solved numerically without any simplifying assumptions. Our results deviate ra...
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Kevork Abazajian, Nicole F. Bell, George M. Fuller, and Yvonne Y. Y. Wong Theoretical Division, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA Kellogg Radiation Laboratory...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2005
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2005.04.038