宇称破坏理论中引力波的朗道阻尼
Landau damping for gravitational waves in parity-violating theories
摘要：
讨论了当宇称对称性被破缺时，在速度双折射存在的情况下，引力波的张量偏振如何受到朗道阻尼的影响。特别是，我们分析了Nieh-Yan和Chern-Simons项在改进的引力理论中的作用，展示了如何在无碰撞介质中的引力扰动可以由亚光速相速度来表征，绕过了广义相对论的著名结果，并允许出现运动阻尼。我们详细研究了介质的热力学性质之间的联系，如温度和质量的粒子与引力波相互作用，和参数统治的宇称违反条款的模型。在这方面，我们概述了色散关系如何在每个模型中产生波数空间的不同区域，其中相速度是亚光速，超光速或不存在。所考虑的模型的定量估计表明，朗道阻尼的现象是不可检测的灵敏度，目前的仪器。
英文摘要：
We discuss how tensor polarizations of gravitational waves can suffer Landau damping in the presence of velocity birefringence, when parity symmetry is explicitly broken. In particular, we analyze the role of the Nieh-Yan and Chern-Simons terms in modified theories of gravity, showing how the gravitational perturbation in collisionless media can be characterized by a subluminal phase velocity, circumventing the well-known results of General Relativity and allowing for the appearance of the kinematic damping. We investigate in detail the connection between the thermodynamic properties of the medium, such as temperature and mass of the particles interacting with the gravitational wave, and the parameters ruling the parity violating terms of the models. In this respect, we outline how the dispersion relations can give rise in each model to different regions of the wavenumber space, where the phase velocity is subluminal, superluminal or does not exist. Quantitative estimates on the considered models indicate that the phenomenon of Landau damping is not detectable given the sensitivity of present-day instruments.
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