论文标题
宇宙黑暗时代增强的小规模结构
Enhanced Small-Scale Structure in the Cosmic Dark Ages
论文作者
论文摘要
我们考虑物质功率谱的后果，该功能谱在小尺度上上升，直到最终被与暗物质粒子性质相关的微物理过程截止。从分离之前直至在非线性方向深处，将弱相互作用的大粒子的扰动进化出来，我们表明非线性结构可以在非常高的红移下大量形成。在这种情况下，物质辐射平等后的暗物质歼灭大大增加。此外，由于可以在广泛的尺度上增加功率谱，因此第一个恒星形成的光晕也可能比平常早。下一个挑战是确定早期的宇宙观察如何限制这种增强的暗物质扰动。
We consider the consequences of a matter power spectrum which rises on small scales until eventually being cutoff by microphysical processes associated with the particle nature of dark matter. Evolving the perturbations of a weakly interacting massive particle from before decoupling until deep in the nonlinear regime, we show that nonlinear structure can form abundantly at very high redshifts. In such a scenario, dark matter annihilation is substantially increased after matter-radiation equality. Furthermore, since the power spectrum can be increased over a broad range of scales, the first star forming halos may form earlier than usual as well. The next challenge is determining how early Universe observations may constrain such enhanced dark matter perturbations.
