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arXiv 1305.4465astro-ph.CO
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星系和星系团中轻微自相互作用冷暗物质的标度关系

Scaling relations of the slightly self-interacting cold dark matter in galaxies and clusters

Man Ho Chan

摘要:

最近在星系和星系团中的观测表明,暗物质密度分布呈现核状结构,这与无碰撞冷暗物质的数值模拟结果相矛盾。自相互作用冷暗物质(SICDM)的想法已被调用,以解决观测和数值模拟之间的差异。本文利用长程SICDM模型导出了星系和星系团中一些重要的标度关系。如果暗物质粒子只有轻微的自相互作用,这些标度关系与星系和星系团中观测数据的经验拟合吻合得很好。此外,可能存在表征芯状结构的通用临界光学深度$τ_c$。这些结果普遍支持SICDM的想法,以解决长期存在的暗物质问题。

英文摘要:

Recent observations in galaxies and clusters indicate dark matter density profiles exhibit core-like structures which contradict to the numerical simulation results of collisionless cold dark matter. The idea of self-interacting cold dark matter (SICDM) has been invoked to solve the discrepancies between the observations and numerical simulations. In this article, I derive some important scaling relations in galaxies and clusters by using the long-range SICDM model. These scaling relations give good agreements with the empirical fittings from observational data in galaxies and clusters if the dark matter particles are only slightly self-interacting. Also, there may exist a universal critical optical depth $τ_c$ that characterizes the core-like structures. These results generally support the idea of SICDM to tackle the long-lasting dark matter problem.

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。

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