Dissipative dark matter self-interactions can affect halo evolution and change its structure. We perform a series of controlled N-body simulations to study impacts of the dissipative interactions on halo properties. The interplay between gravitational contraction and collisional dissipation can significantly speed up the onset of gravothermal collapse, resulting in a steep inner density profile. For reasonable choices of model parameters controlling the dissipation, the collapse timescale can be a factor of 10-100 shorter than that predicted in purely elastic self-interacting dark matter. The effect is maximized when energy loss per collision is comparable to characteristic kinetic energy of dark matter particles in the halo. Our simulations provide guidance for testing the dissipative nature of dark matter with astrophysical observations.

中文翻译：

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耗散暗物质晕的结构

耗散暗物质自相互作用会影响晕演化并改变其结构。我们进行了一系列受控 N 体模拟，以研究耗散相互作用对光晕特性的影响。重力收缩和碰撞耗散之间的相互作用可以显着加速重力坍塌的开始，导致陡峭的内部密度剖面。对于控制耗散的模型参数的合理选择，坍缩时间尺度可以比纯弹性自相互作用暗物质中预测的时间尺度短 10-100 倍。当每次碰撞的能量损失与光晕中暗物质粒子的特征动能相当时，这种效果会最大化。我们的模拟为通过天体物理观测测试暗物质的耗散性质提供了指导。