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arXiv 1801.08609astro-ph.COhep-ph
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暗物质-质子相互作用有效理论的第一宇宙学约束

First Cosmological Constraint on the Effective Theory of Dark Matter-Proton Interactions

Kimberly K. Boddy, Vera Gluscevic

摘要:

我们在为直接探测而开发的非相对论性有效场论的形式体系中获得了对暗物质和质子之间相互作用的第一个宇宙学约束。对于有效理论中的每个相互作用算子,通过入射粒子的相对速度的不同幂次进行参数化,我们使用普朗克2015宇宙微波背景(CMB)温度,偏振和透镜各向异性来设置所有暗物质质量超过15 keV的散射截面的上限。我们发现,对于相互作用与更强的依赖于速度,暗物质和重子保持热耦合更长的时间,但相互作用强度被抑制在低温普朗克观测相关,因此较少的约束。同时,在小暗物质质量的限制下,具有较强速度依赖性的横截面受到更大的约束。在所有的情况下,暗物质-质子散射的影响是最突出的小尺度的CMB功率谱和物质功率谱,因此,我们预计在目前的限制与地面的CMB实验和星系调查的数据大幅改善。

英文摘要:

We obtain the first cosmological constraints on interactions between dark matter and protons within the formalism of nonrelativistic effective field theory developed for direct detection. For each interaction operator in the effective theory, parametrized by different powers of the relative velocity of the incoming particles, we use the Planck 2015 cosmic microwave background (CMB) temperature, polarization, and lensing anisotropy to set upper limits on the scattering cross section for all dark matter masses above 15 keV. We find that for interactions associated with a stronger dependence on velocity, dark matter and baryons stay thermally coupled for longer, but the interaction strengths are suppressed at the low temperatures relevant for Planck observations and are thus less constrained. At the same time, cross sections with stronger velocity dependencies are more constrained in the limit of small dark matter mass. In all cases, the effect of dark matter-proton scattering is most prominent on small scales in the CMB power spectra and in the matter power spectrum, and we thus expect substantial improvement over the current limits with data from ground-based CMB experiments and galaxy surveys.

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