AI 中文总结
研究具有对称性破缺的暴胀模型中的标量诱导引力波，通过带电标量场与规范场耦合产生，当混合足够大时可探测，规范场激发晚时纵向模式等起作用，参数影响信号，为区分中性和带电情形提供特征标志。
AI 中文摘要
我们研究了具有对称性破缺的暴胀模型中的标量诱导引力波（SIGWs），其中带电标量场通过一个动力学函数与阿贝尔规范场的各向同性三重态耦合。当暴胀子与规范场微扰之间的混合足够大时，此类SIGWs可增强到可探测水平。我们发现，仅当规范场激发在暴胀期间足够晚发生时，纵向模式和微扰之间的电荷相关混合才变得重要。在此情况下，相应的SIGWs会转移到超高频，通常在GHz频段附近。我们表明，表征纵向模式和电荷相关混合效应的参数以定性不同的方式影响信号。这为通过随机引力波背景的频率分布区分中性情形和带电情形提供了特征标志。
英文摘要
We investigate scalar-induced gravitational waves (SIGWs) in an inflationary model with symmetry breaking, in which charged scalar fields are coupled to an isotropic triplet of Abelian gauge fields through a kinetic function. Such SIGWs can be enhanced to a detectable level when the mixing between the inflaton and gauge-field perturbations is sufficiently large. We find that the longitudinal mode and the charge-dependent mixing between perturbations become relevant only when the gauge-field excitation occurs sufficiently late during inflation. In this regime, the corresponding SIGWs are shifted to ultra-high frequencies, typically can around the GHz band. We show that the parameters characterizing the effects of the longitudinal mode and charge-dependent mixing affect the signal in qualitatively different ways. This provides characteristic signatures for distinguishing the neutral case from the charged one through the frequency profile of the stochastic gravitational-wave background.
Comments15 pages, 15 figures, 1 table
