The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra

The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra
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阿塔卡马宇宙学望远镜:DR4 功率谱对暗物质-重子相互作用的限制

DOI:
10.1088/1475-7516/2023/02/046
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发表时间:
2023
影响因子:
6.4
通讯作者:
Hincks, Adam
Hincks, Adam
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Zack;An, Rui;Gluscevic, Vera;Boddy, Kimberly K.;Bond, J. Richard;Calabrese, Erminia;Dunkley, Jo;Gallardo, Patricio A.;Guan, Yilun;Hincks, Adam

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不同的天体物理学观测表明存在冷暗物质,它只与辐射和普通重子物质发生引力相互作用。暗物质和重子之间的任何非零耦合都将为理解暗物质的粒子性质迈出重要的一步。宇宙微波背景辐射(CMB)的测量提供了对这种耦合的限制,补充了实验室的研究。在这项工作中,我们把上限的各种模型的暗物质弹性散射质子和电子相结合的大规模CMB数据从普朗克卫星的小尺度信息从阿塔卡玛宇宙望远镜(ACT)DR4数据。在速度无关的散射的情况下,我们得到的质子的相互作用截面上的界限是40%,比以前的约束更紧的CMB各向异性。对于一些速度依赖散射的模型,我们发现最佳拟合截面与2σ偏差为零,但这些散射模型在模型选择方面并没有统计上优于ΛCDM。
Diverse astrophysical observations suggest the existence of cold dark matter that interacts only gravitationally with radiation and ordinary baryonic matter. Any nonzero coupling between dark matter and baryons would provide a significant step towards understanding the particle nature of dark matter. Measurements of the cosmic microwave background (CMB) provide constraints on such a coupling that complement laboratory searches. In this work we place upper limits on a variety of models for dark matter elastic scattering with protons and electrons by combining large-scale CMB data from the Planck satellite with small-scale information from Atacama Cosmology Telescope (ACT) DR4 data. In the case of velocity-independent scattering, we obtain bounds on the interaction cross section for protons that are 40% tighter than previous constraints from the CMB anisotropy. For some models with velocity-dependent scattering we find best-fitting cross sections with a 2σ deviation from zero, but these scattering models are not statistically preferred over ΛCDM in terms of model selection.
DOI: --
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