Relic neutrino freeze-out: Dependence on natural constants

被引：33

作者：

Birrell, Jeremiah ^{[1
,2
]}

Yang, Cheng Tao ^{[2
,3
,4
]}

Rafelski, Johann ^{[2
]}

机构：

[1] Univ Arizona, Program Appl Math, Tucson, AZ 85721 USA

[2] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[3] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[4] Natl Taiwan Univ, Grad Inst Astrophys, Taipei 10617, Taiwan

来源：

NUCLEAR PHYSICS B | 2015年 / 890卷

关键词：

BIG-BANG NUCLEOSYNTHESIS; SPECTRA;

D O I：

10.1016/j.nuclphysb.2014.11.020

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Analysis of cosmic microwave background radiation fluctuations favors an effective number of neutrinos, N-v > 3. This motivates a reinvestigation of the neutrino freeze-out process. Here we characterize the dependence of N-v on the Standard Model (SM) parameters that govern neutrino freeze-out. We show that N-v depends on a combination eta of several natural constants characterizing the relative strength of weak interaction processes in the early Universe and on the Weinberg angle sin(2) theta w. We determine numerically the dependence N-v(eta, sin(2) theta w) and discuss these results. The extensive numerical computations are made possible by two novel numerical procedures: a spectral method Boltzmann equation solver adapted to allow for strong reheating and emergent chemical non-equilibrium, and a method to evaluate Boltzmann equation collision integrals that generates a smooth integrand. (C) 2014 The Authors. Published by Elsevier B.V.

引用

页码：481 / 517

页数：37

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