Self Interactions in Warm Dark Matter: A View from Cosmological Perturbation Theory
Self Interactions in Warm Dark Matter: A View from Cosmological Perturbation Theory
复制标题
暖暗物质中的自相互作用：宇宙微扰理论的观点
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
G. Giordano
中科院分区：
文献类型：
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作者：
R. Yunis;C. Argüelles;C. Scóccola;D. L. Nacir;G. Giordano
摘要从宇宙学微扰理论(CPT)出发，对自作用暖暗物质(SI-WDM)模型进行了简要的综述。其目的是通过从理论和数值两个方面提出一个关于SI-WDM对线性功率谱的影响及其对非线性结构形成的影响的更一般的框架，从而推广传统的冷DM模型。在描述了理论背景之后，我们给出了玻尔兹曼系统中碰撞项的有用的解析表达式，并在松弛时间近似(RTA)下给出了一些数值结果。我们认为，与热等离子体分离的大质量DM粒子是相对论的。我们以一种有效的方式引入了散射振幅下的弹性DM-DM相互作用，其中散射幅度是大质量介体的主要原因。特别关注自相互作用解耦机制，分析了粒子在相对论和非相对论条件下经历自解耦的情形。
Abstract We provide a short overview into Self Interacting Warm Dark Matter (SI-WDM) models from the context of Cosmological Perturbation Theory (CPT). The aim is to generalize conventional Cold DM models, by proposing a more general framework both from theoretical as well as from numerical fronts, on the effects of SI-WDM on the linear power spectrum and its consequent imprints on non-linear structure formation. After describing the theoretical background, we present useful analytic expressions for the collision terms in the Boltzmann Hierarchies, and provide some numerical results within the Relaxation Time Approximation (RTA). We consider massive DM particles that decouple from the hot plasma while relativistic. We introduce elastic DM–DM interactions under an ansatz for the scattering amplitude that accounts for massive mediators on an effective way. Paying special attention to the self interaction decoupling mechanisms, we analyze scenarios where the particle undergoes self decoupling while relativistic as well as while non relativistic.
影响因子：
4.8
作者：
Alex Fitts;M. Boylan-Kolchin;Brandon Bozek;J. Bullock;A. Graus;V. Robles;P. Hopkins;K. El-Badry;S. Garrison-Kimmel;C. Faucher-Giguère;A. Wetzel;D. Keres̆
通讯作者：
Alex Fitts;M. Boylan-Kolchin;Brandon Bozek;J. Bullock;A. Graus;V. Robles;P. Hopkins;K. El-Badry;S. Garrison-Kimmel;C. Faucher-Giguère;A. Wetzel;D. Keres̆