Title: Primordial Gravitational Waves from Axion-Gauge Fields Dynamics Show Chinese title

Title: 从轴子-规范场动力学产生的原初引力波

Abstract: Inspired by the chromo-natural inflation model of Adshead&Wyman, we reshape its scalar content to relax the tension with current observational bounds. Besides an inflaton, the setup includes a spectator sector in which an axion and SU(2) gauge fields are coupled via a Chern-Simons-type term. The result is a viable theory endowed with an alternative production mechanism for gravitational waves during inflation. The gravitational wave signal sourced by the spectator fields can be much larger than the contribution from standard vacuum fluctuations, it is distinguishable from the latter on the basis of its chirality and, depending on the theory parameters values, also its tilt. This production process breaks the well-known relation between the tensor-to-scalar ratio and the energy scale of inflation. As a result, even if the Hubble rate is itself too small for the vacuum to generate a tensor amplitude detectable by upcoming experiments, this model still supports observable gravitational waves. Show Chinese abstract

Abstract: 受Adshead和Wyman提出的色天然暴胀模型的启发，我们重塑了其标量内容以缓解与当前观测限制之间的张力。 除了暴胀子外，该设定还包括一个观测者扇区，在其中轴子和SU(2)规范场通过一种Chern-Simons型项耦合在一起。 结果是一种可行的理论，具有在暴胀期间产生引力波的替代机制。 由观测者场源引的引力波信号可能比标准真空涨落的贡献大得多，根据其手性和，依赖于理论参数值，也可能取决于其倾斜度，可以将其与后者区分开来。 这一产生过程打破了张量-标量比与暴胀能量尺度之间众所周知的关系。 因此，即使暴胀的哈勃率本身太小，无法通过即将到来的实验检测到张量振幅，该模型仍然支持可观察到的引力波。