Title: Chirality oscillation of primordial gravitational waves during inflation Show Chinese title

Title: 原初引力波在暴胀期间的手性振荡

Abstract: We show that if the gravitational Chern-Simons term couples to a massive scalar field ($m>H$), the primordial gravitational waves (GWs) will show itself the chirality oscillation, i.e., the amplitudes of the left- and right-handed GWs modes will convert into each other and oscillate in their propagations. This oscillation will eventually develop a permanent difference of the amplitudes of both modes, which leads to nearly opposite oscillating shapes in the power spectra of the left- and right-handed primordial GWs. We discuss its implication to the CMB B-mode polarization. Show Chinese abstract

Abstract: 我们证明，如果引力陈-西蒙斯项与一个质量标量场（$m>H$）耦合，原初引力波（GWs）将表现出手性振荡，即左旋和右旋引力波模式的振幅将在传播过程中相互转换并发生振荡。 这种振荡最终会导致两种模式振幅出现永久性的差异，从而在左旋和右旋原初引力波功率谱中产生几乎相反的振荡形状。 我们讨论了其对宇宙微波背景（CMB）B模式极化的影响。