论文标题
斧头暗物质中的引力波
Gravitational Waves in Axion Dark Matter
论文作者
论文摘要
斧头暗物质很有趣，因为它允许与重力Chern-Simons术语结合自然耦合。在存在斧头背景的情况下，重力Chern-simons项在重力部门中产生违反的效果，尤其是对引力波的传播。以前，已经表明，轴突场的相干振荡导致具有特定频率的重力波的参数扩增。在本文中，我们着重于违反Chern-Simon耦合的均等作用，并显示出重力双折射的发生。我们还发现重力波速度的光速偏差。我们对GW170817和GRB170817A的观察到的轴突切尔西蒙耦合常数和轴线暗物质的丰度给出了约束。
Axion dark matter is interesting as it allows a natural coupling to the gravitational Chern-Simons term. In the presence of an axion background, the gravitational Chern-Simons term produces parity violating effects in the gravitational sector, in particular on the propagation of gravitational waves. Previously, it has been shown that the coherent oscillation of the axion field leads to a parametric amplification of gravitational waves with a specific frequency. In this paper we focus on the parity violating effects of the Chern-Simon coupling and show the occurrence of gravitational birefringence. We also find deviation from the speed of light of the velocity of the gravitational waves. We give constraints on the axion-Chern-Simons coupling constant and the abundance of the axion dark matter from the observation of GW170817 and GRB170817A.
