非对称暗物质在非旋转中子星中的俘获驱动演化
Capture Driven Evolution of Asymmetric Dark Matter in Non-rotating Neutron Stars
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中文总结 AI 辅助
该研究构建自洽框架分析非对称暗物质在非旋转中子星中的俘获演化，发现仅极端环境下暗物质积累产生的结构变化显著，现实环境中其对引力波观测的可探测信号可忽略。
中文摘要 AI 辅助
我们开发了一个自洽框架，将暗物质俘获与中子星的长期积累及结构演化关联起来，从而可量化天体物理时标内，俘获驱动的非对称暗物质对引力波观测物理量的影响。我们采用三层多方物态方程（EoS）构建冷非旋转中子星模型，并通过双流体托尔曼-奥本海默-沃尔科夫（Tolman Oppenheimer Volkoff）方程耦合暗物质组分，再利用随时间变化的暗物质俘获形式重构其长期演化。通过探索涵盖最大化俘获效率的极端环境在内的广泛天体物理条件，我们推导了哈勃时间内暗物质积累效应的保守上限。即便在这些刻意的乐观假设下，积累的暗物质组分仍处于次主导地位，仅引发有限的结构修改：具体而言，暗物质积累会提升恒星致密性，同时抑制洛夫数（Love number）与潮汐形变率。显著演化仅发生在类似银河系中心的极端环境及哈勃时标下，而对于现实的银河系或星系团暗物质密度，对应的偏差仍可忽略。因此我们得出结论：俘获驱动的暗物质积累，不太可能在当前或近期未来的中子星引力波观测中产生可探测的信号。
英文摘要
We develop a self-consistent framework that connects dark matter capture to the long term accumulation and structural evolution of neutron stars, allowing us to quantify the impact of capture driven asymmetric dark matter on gravitational wave observables over astrophysical timescales. We model cold, non-rotating neutron stars using a three layer polytropic EoS coupled to a dark matter component through the two fluid Tolman Oppenheimer Volkoff equations, and reconstruct the long term evolution using a time dependent dark matter capture formalism. By exploring a wide range of astrophysical conditions, including extreme environments designed to maximize the capture efficiency, we derive conservative upper bounds on the effects of dark matter accumulation over a Hubble time. Even under these deliberately optimistic assumptions, the accumulated dark matter component remains subdominant and induces limited structural modifications. In particular, dark matter accumulation increases the stellar compactness while suppressing the Love number and tidal deformability. Significant evolution occurs only in extreme Galactic center like environments over Hubble time scales, whereas for realistic Galactic or cluster dark matter densities the corresponding deviations remain negligible. We therefore conclude that capture driven dark matter accumulation is unlikely to produce detectable signatures in current or near future gravitational wave observations of neutron stars.
