有质量标量模的引力朗道阻尼
Gravitational Landau Damping for massive scalar modes
摘要：
我们建立了在非碰撞气体中传播的引力标量波的朗道阻尼的可能性。特别是，在均匀性和各向同性的假设下，我们描述了在平衡与Jüttner-Maxwell分布的介质，我们解析地确定从Vlasov方程的阻尼率。我们发现，只有当波的相速度是亚光速在整个介质内的传播发生阻尼。最后，我们采用数值方法研究了宇宙学背景下的相对论介质。
英文摘要：
We establish the possibility of Landau damping for gravitational scalar waves which propagate in a non-collisional gas of particles. In particular, under the hypothesis of homogeneity and isotropy, we describe the medium at the equilibrium with a Jüttner-Maxwell distribution, and we analytically determine the damping rate from the Vlasov equation. We find that damping occurs only if the phase velocity of the wave is subluminal throughout the propagation within the medium. Finally, we investigate relativistic media in cosmological settings by adopting numerical techniques.
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