arXiv 1208.28072012-08hep-thastro-ph.COhep-ph

非阿贝尔规范场暴胀模型中的轻子生成

Leptogenesis in Inflationary models with Non-Abelian Gauge Fields

Azadeh Maleknejad, Mahdiyar Noorbala, M. M. Sheikh-Jabbari

备注：: matches published version
发表信息：: General Relativity and Gravitation (2018) 50:110
DOI：: 10.1007/s10714-018-2435-8

摘要：

[1]中引入了一种稀薄成因的情景，该情景在粒子物理设置的标准模型中的暴胀期间起作用。在这种情况下，轻子数是由引力手征反常产生的，对于由赝标场驱动的暴胀模型，手征反常具有非零的期望值。在这里，我们观察到涉及非阿贝尔规范场的暴胀模型，例如色球自然暴胀[2]或规范暴胀[3]，具有宇称违反张量模（引力子）谱，并且自然地导致引力手征异常的非零期望值。因此，你有一个与这些暴胀设置相关的自然的瘦生情景，\emph{inflato-natural leptogenesis}。我们认为，重子-光子数密度的观测值可以在这些模型的参数的自然范围内得到解释。

英文摘要：

A scenario of leptogenesis was introduced in [1] which works during inflationary period within standard model of particle physics setup. In this scenario lepton number is created by the gravitational chiral anomaly which has a non-zero expectation value for models of inflation driven by pseudoscalar field(s). Here, we observe that models of inflation involving non-Abelian gauge fields, e.g. the chromo-natural inflation [2] or the gauge-flation [3], have a parity-violating tensor mode (graviton) spectrum and naturally lead to a non-vanishing expectation value for the gravitational chiral anomaly. Therefore, one has a natural leptogenesis scenario associated with these inflationary setups, \emph{inflato-natural leptogenesis}. We argue that the observed value of baryon-to-photon number density can be explained in a natural range of parameters in these models.

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