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arXiv 0812.1253astro-ph
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具有独立中微子分布函数的大爆炸核合成

Big Bang Nucleosynthesis with Independent Neutrino Distribution Functions

Christel J. Smith, George M. Fuller, Michael S. Smith

摘要:

我们已经进行了新的大爆炸核合成计算,采用任意指定的,时间依赖的中微子和反中微子分布函数的每一个高达四个中微子的味道。我们自洽耦合这些分布的热力学,膨胀率和标度因子的时间/温度的关系,以及所有相关的弱,电磁和强核反应过程中的早期宇宙。用这种方法,我们可以处理任何可能出现中微子或反中微子光谱畸变的情况。这些情形可能包括,例如,衰变粒子,活跃-无菌中微子振荡,和活跃-活跃中微子振荡在存在显着轻子数。我们的计算允许轻子数和不育中微子约束与观测确定的原始氦和氘丰度。我们已经修改了一个标准的BBN代码来执行这些计算,并将其提供给社区。

英文摘要:

We have performed new Big Bang Nucleosynthesis calculations which employ arbitrarily-specified, time-dependent neutrino and antineutrino distribution functions for each of up to four neutrino flavors. We self-consistently couple these distributions to the thermodynamics, the expansion rate and scale factor-time/temperature relationship, as well as to all relevant weak, electromagnetic, and strong nuclear reaction processes in the early universe. With this approach, we can treat any scenario in which neutrino or antineutrino spectral distortion might arise. These scenarios might include, for example, decaying particles, active-sterile neutrino oscillations, and active-active neutrino oscillations in the presence of significant lepton numbers. Our calculations allow lepton numbers and sterile neutrinos to be constrained with observationally-determined primordial helium and deuterium abundances. We have modified a standard BBN code to perform these calculations and have made it available to the community.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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