Chance和Chandra（以及排斥性暗物质）
Chance and Chandra (and repulsive dark matter)
摘要：
几个例子给出了钱德拉的工作统计和随机问题，涉及到天体物理学中的开放问题，特别是他的理论动态松弛系统与反平方粒子间的力量。混沌和可积性在这个理论中的作用需要澄清，特别是对于具有主导中心质量的系统。在这个前奏之后，我们讨论了一种假设形式的排斥玻色子暗物质。这种排斥导致了非平凡的热力学行为，包括超流性，并倾向于抑制动力学摩擦，大大减少了施加在旋转星系棒上的阻力。然而，这种形式的暗物质可能被排除在外，至少对于允许晕在哈勃时间内达到热平衡的参数来说是如此。粒子质量和粒子间排斥力的组合决定了暗晕的最小核心半径。从子弹星系团推断出的暗物质碰撞性界限限制了第二种组合。只有在预测晕核外不可接受的旋转曲线的参数下，才有可能满足这两个约束。
英文摘要：
A few examples are given of Chandra's work on statistical and stochastic problems that relate to open questions in astrophysics, in particular his theory of dynamical relaxation in systems with inverse-square interparticle forces. The roles of chaos and integrability in this theory require clarification, especially for systems having a dominant central mass. After this prelude, a hypothetical form of repulsive bosonic dark matter is discussed. The repulsion leads to nontrivial thermodynamic behavior, including superfluidity, and would tend to suppress dynamical friction, greatly reducing the drag exerted on rotating galactic bars. However, this form of dark matter can probably be ruled out, at least for parameters that allow halos to reach thermal equilibria within a Hubble time. One combination of the particle mass and interparticle repulsion determines the minimum core radius of dark halos. Bounds on dark-matter collisionality inferred from the Bullet Cluster constrain a second combination. It is possible to satisfy both constraints only for parameters that predict unacceptable rotation curves outside the halo core.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
