标题： 头对头碰撞的模糊/冷暗物质次结构 显示英文标题

标题： Head-on collisions of fuzzy/cold dark matter subhalos

摘要： 我们使用不同的数值方法对紧凑的暗物质子晕进行了正面碰撞模拟，分别针对模糊暗物质（FDM）和冷暗物质（CDM）模型。 对于FDM，我们使用伪谱求解器求解薛定谔-泊松方程，而对于CDM，我们采用平滑粒子流体动力学N体代码。 我们的结果表明，在FDM模型中，子晕的速度下降显著大于CDM模型，尤其是在初始速度较低时，这是由于引力冷却——一种在FDM中通过耗散动能来稳定系统的独特机制。 这两种暗物质模型在能量耗散方面的显著差异表明，FDM可能为理解星系团碰撞过程中暗物质的动力学行为提供有价值的见解，例如在子弹星系团和Abell 520中观察到的现象。 这些发现强烈表明，FDM不仅能够解释这些复杂的天体物理现象，还作为传统CDM模型的有力替代方案，提供了对暗物质行为长期分歧问题的解决方案。 显示英文摘要

摘要： We perform head-on collision simulations of compact dark matter subhalos using distinct numerical methods for fuzzy dark matter (FDM) and cold dark matter (CDM) models. For FDM, we solve the Schr\"odinger-Poisson equations with a pseudospectral solver, while for CDM, we utilize a smoothed particle hydrodynamics N-body code. Our results show that velocity decrease of subhalos is significantly greater in FDM model than in CDM, particularly at lower initial velocities, attributed to gravitational cooling-a unique mechanism of stabilizing in FDM with dissipating kinetic energy. This stark contrast in energy dissipation between two DM models suggests that FDM may offer valuable insights into understanding the dynamic behaviors of DM during galaxy cluster collisions, such as those observed in the Bullet cluster and Abell 520. These findings strongly suggest that FDM is not only capable of explaining these complex astrophysical phenomena but also serves as a compelling alternative to the traditional CDM model, offering resolutions to longstanding discrepancies in DM behavior.