Precision early universe thermodynamics made simple: Neff and neutrino decoupling in the Standard Model and beyond,Journal of Cosmology and Astroparticle Physics

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Precision early universe thermodynamics made simple: Neff and neutrino decoupling in the Standard Model and beyond
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2020-05-26 , DOI: 10.1088/1475-7516/2020/05/048
Miguel Escudero Abenza

Precision measurements of the number of effective relativistic neutrino species and the primordial element abundances require accurate theoretical predictions for early Universe observables in the Standard Model and beyond. Given the complexity of accurately modelling the thermal history of the early Universe, in this work, we extend a previous method presented by the author in [1] to obtain simple, fast and accurate early Universe thermodynamics. The method is based upon the approximation that all relevant species can be described by thermal equilibrium distribution functions characterized by a temperature and a chemical potential. We apply the method to neutrino decoupling in the Standard Model and find NeffSM = 3.045—a result in excellent agreement with previous state-of-the-art calculations. We apply the method to study the thermal history of the Universe in the presence of a very light (1 eV

中文翻译：

精确的早期宇宙热力学变得简单：标准模型及其他模型中的 Neff 和中微子解耦

对有效相对论中微子种类的数量和原始元素丰度的精确测量需要对标准模型及以后的早期宇宙可观测物进行准确的理论预测。鉴于准确模拟早期宇宙热历史的复杂性，在这项工作中，我们扩展了作者在 [1] 中提出的先前方法，以获得简单、快速和准确的早期宇宙热力学。该方法基于近似值，即所有相关物种都可以通过以温度和化学势为特征的热平衡分布函数来描述。我们将该方法应用于标准模型中的中微子解耦，并发现 NeffSM = 3.045——结果与之前最先进的计算非常吻合。

更新日期：2020-05-26

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