论文标题
从轴突样粒子暗物质的碎片化引力波
Gravitational waves from the fragmentation of axion-like particle dark matter
论文作者
论文摘要
错位机制允许产生诸如轴突状颗粒（ALP）之类的轻鳞玻色子的效率，通常非常冷，从而使它们成为吸引人的暗物质候选者。但是，在某些情况下，例如在存在单轨道的情况下，阿尔卑斯山的自我互动可以足够强大，以使振荡发作后不久的均匀场碎片。由此产生的较大的不均匀性会导致引力波（GWS）的产生。我们研究了碎片化的非线性动力学以及随后的湍流状态，并计算从该过程产生的随机GW背景。如果时间演化具有超偏移动力学的扩展中间阶段，则可以增强GW背景，这是由于电位底部的质量很小。但是，这种增强受到暗物质仍然足够冷的要求的限制。在某些情况下，由此产生的GW可能会在未来的GW探测器的范围内触及，从而可以对这种类型的暗物质进行互补的探测。
The misalignment mechanism allows for the efficient, and usually very cold, production of light scalar bosons, such as axion-like particles (ALPs), making them an appealing dark matter candidate. However, in certain cases, such as in the presence of a monodromy, the self-interactions of ALPs can be sufficiently strong such that the homogeneous field fragments soon after the onset of oscillations. The resulting large inhomogeneities can lead to the production of gravitational waves (GWs). We investigate the nonlinear dynamics of fragmentation, as well as of the subsequent turbulent regime, and calculate the stochastic GW background that is produced from this process. The GW background can be enhanced if the time evolution features an extended intermediate phase of ultrarelativistic dynamics due to a small mass at the bottom of the potential. Yet, this enhancement is limited by the requirement that the dark matter remains sufficiently cold. In some cases the resulting GWs may be within reach of future GW detectors, allowing a complementary probe of this type of dark matter.
