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arXiv 1302.3898hep-phastro-ph.CO
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超越无碰撞暗物质:暗物质晕结构的粒子物理动力学

Beyond Collisionless Dark Matter: Particle Physics Dynamics for Dark Matter Halo Structure

Sean Tulin, Hai-Bo Yu, Kathryn M. Zurek

摘要:

从矮星系到星系团,暗物质(DM)的自相互作用对结构的形成和演化有着重要的意义。我们研究了自相互作用DM通过光介体的动力学,侧重于量子共振制度的散射截面具有非平凡的速度依赖性。虽然有长期存在的迹象表明,在宇宙中的小尺度结构的观测不符合碰撞DM的预测,DM自相互作用的理论研究和模拟集中在参数制度与简单的散射截面的解析解,与常数或经典的速度(和没有角)的依赖。我们设计了一种方法,使我们能够更广泛地探索自散射的速度和角度依赖性,在强耦合共振和经典制度,其中许多部分模式是必要的实现的结果。我们映射出整个参数空间DM自我相互作用-和结构观测的影响-作为耦合和DM和介质质量的函数。我们推导出一个新的解析公式来描述共振s波散射。最后,我们表明,DM自相互作用可以通过间接检测实验DM湮灭索末菲增强的观察。

英文摘要:

Dark matter (DM) self-interactions have important implications for the formation and evolution of structure, from dwarf galaxies to clusters of galaxies. We study the dynamics of self-interacting DM via a light mediator, focusing on the quantum resonant regime where the scattering cross section has a non-trivial velocity dependence. While there are long-standing indications that observations of small scale structure in the Universe are not in accord with the predictions of collisionless DM, theoretical study and simulations of DM self-interactions have focused on parameter regimes with simple analytic solutions for the scattering cross section, with constant or classical velocity (and no angular) dependence. We devise a method that allows us to explore the velocity and angular dependence of self-scattering more broadly, in the strongly-coupled resonant and classical regimes where many partial modes are necessary for the achieving the result. We map out the entire parameter space of DM self-interactions --- and implications for structure observations --- as a function of the coupling and the DM and mediator masses. We derive a new analytic formula for describing resonant s-wave scattering. Finally, we show that DM self-interactions can be correlated with observations of Sommerfeld enhancements in DM annihilation through indirect detection experiments.

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