Dark radiation in spectator axion?gauge models
Dark radiation in spectator axion?gauge models
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观察轴子规范模型中的暗辐射
DOI：
10.1093/ptep/ptac029
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发表时间：
2022
影响因子：
3.5
通讯作者：
Seto Osamu
中科院分区：
文献类型：
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作者：
Kakizaki Mitsuru;Ogata Masahito;Seto Osamu
在轴子-规范场模型的框架下，暴胀时期的原初引力波扰动不仅可以由引力子的量子涨落产生，也可以由与轴子场耦合的隐规范场的动力学产生。我们研究了在暴胀过程中和暴胀后，一个附加的隐SU（2）规范群的轴子和规范场的演化以及它们的能量密度。我们表明，额外的辐射分量的隐藏的规范玻色子产生的轴子衰变可以是相当大的规范场源的额外的引力波是次主导的情况下。我们指出，未来对暗辐射能量的测量，如CMB-S4，可以对这种宇宙学场景施加重要的限制。
In the framework of axion–gauge field models, primordial gravitational wave perturbations could be generated during the inflationary epoch from not only the quantum fluctuation of gravitons but also the dynamics of hidden gauge fields coupled with an axion field. We investigate the evolution of the axion and the gauge field of an additional hiddenSU(2) gauge group and those energy densities during and after the inflation. We show that the extra radiation component of the hidden gauge bosons produced by the axion decay can be sizable in the cases where the gauge-field-sourced additional gravitational waves is subdominant. We point out that future measurements of the dark radiation energy, such as CMB-S4, can impose significant constraints on this cosmological scenario.