标题： 泡沫暗物质来自单色性 显示英文标题

标题： Foamy Dark Matter from Monodromies

摘要： 我们研究了由单色性扩展场范围的轴子样粒子（ALP）暗物质的动力学。单色势在与标准模型粒子的耦合较大时也能产生足够的暗物质。该势通常具有多个“波动”，导致涨落迅速增长。通过经典统计场论模拟，我们超越了线性区域，并在非线性和甚至非微扰区域内处理该系统。对于足够强的波动，初始均匀场会完全转化为涨落。这些涨落对应于具有非零速度的暗物质粒子，我们考虑了由此带来的结构形成限制以及对现今暗物质密度的影响。由于所有暗物质均由这些强涨落组成，暗物质密度在尺度$\lesssim 10^{6}\,{\rm km}\sqrt{{\rm eV}/m_a}$上表现出大的$\mathcal{O}(1)$波动。 显示英文摘要

摘要： We investigate the dynamics of axion-like particle (ALP) dark matter where the field range is enlarged by a monodromy. The monodromy potential allows sufficient production of dark matter also at larger couplings to the Standard Model particles. The potential typically features a number of "wiggles" that lead to a rapid growth of fluctuations. Using classical-statistical field theory simulations we go beyond the linear regime and treat the system in the non-linear and even non-perturbative regime. For sufficiently strong wiggles the initially homogeneous field is completely converted into fluctuations. The fluctuations correspond to dark matter particles with a non-vanishing velocity and we consider the corresponding restrictions from structure formation as well as the effects on today's dark matter density. Since all the dark matter is made up from these strong fluctuations, the dark matter density features large, $\mathcal{O}(1)$ fluctuations at scales $\lesssim 10^{6}\,{\rm km}\sqrt{{\rm eV}/m_a}$.