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arXiv 2604.22013astro-ph.GA
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自相互作用暗物质晕的扩展参数模型

An Extended Parametric Model for Self-interacting Dark Matter Halos

Carnegie Observatories(卡内基观测站);Department of Astronomy & Astrophysics, University of California, San Diego(加州大学圣地亚哥分校天文与天体物理学系)

Siddhesh Raut, Ethan Nadler, Andrew Benson

AI总结:

本文改进了自相互作用暗物质晕的参数模型,考虑质量吸积对gravothermal演化的效应,修正了原有模型对V_max的预测偏差,提高了模型准确性。

摘要:

我们改进了Yang等人(2024b)提出的自相互作用暗物质(SIDM)晕密度轮廓演化的参数模型,考虑了质量吸积对SIDM晕gravothermal演化的效应。原始参数模型能准确预测V_max和R_max,但对某些场晕在z=0时的V_max预测偏高。这种差异源于原始模型预测这些场晕的gravothermal演化速率比宇宙放大模拟测量的快。我们提出质量吸积对SIDM晕演化的影响未被原始参数模型完全捕捉。我们的扩展参数模型假设平滑的质量吸积通过将SIDM晕推回Navarro-Frenk-White (NFW)轮廓(如冷暗物质情况)来延迟核心坍缩。我们发现,该扩展模型能显著减少对V_max的预测误差,相比原始模型提供了更准确的SIDM晕演化模型。

英文摘要:

We improve upon the parametric model for the evolution of the density profiles of self-interacting dark matter (SIDM) halos introduced in Yang et al. (2024b), by considering the effects of mass accretion on a SIDM halo's gravothermal evolution. The original parametric model accurately predicts parameters $V_{\max}$ and $R_{\max}$, but with a tendency to overpredict $V_{\max}$ at $z=0$ for a subset of field halos. This discrepancy results from the parametric model predicting a faster rate of gravothermal evolution for these field halos compared to that measured in cosmological zoom-in simulations. We propose that the effects of mass accretion on the evolution of SIDM halos are not fully captured by the original parametric model. Our extended parametric model assumes that smooth mass accretion delays core-collapse by driving the SIDM halo back toward a Navarro-Frenk-White (NFW) profile (as it would have in the case of cold dark matter). We find that this extended model is able to substantially reduce the error in predicted $V_{\max}$ for halos compared to the original model, providing a more accurate model of SIDM halo evolution.

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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