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arXiv 2201.01888astro-ph.COastro-ph.GAastro-ph.IM
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暖暗物质对宇宙中微子背景各向异性的影响

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Christopher G. Tully, Gemma Zhang

摘要:

大质量中微子的宇宙中微子背景(C $ν$ B)各向异性是研究大尺度结构形成的一种独特的方法。与电磁辐射相比,大质量中微子的红移距离测量完全不同。大质量中微子中的C $ν$ B各向异性响应于由相对高的$k$模所播种的引力势中的非相对论运动而增长。暖暗物质(WDM)与冷暗物质(CDM)宇宙学中大尺度结构形成的早期阶段的差异对C $ν$ B各向异性的大小有影响,其对角功率谱的贡献在高$k$模处达到峰值。我们以2、3或7 keV惰性中微子组成的WDM为例,表明在相对于CDM的角功率谱中,对于0.05 eV中微子,C $ν$ B各向异性在高$l$多极矩处下降。在相同的角标度下,人们可以在CMB中观察到重子声学振荡,C $ν$ B各向异性开始对WDM和CDM宇宙学的差异变得敏感。在C $ν$ B中微子天空图中精确测量高$l$多极子是利用自旋极化的氚原子超流体的薄膜靶进行PIMMY实验的潜在可能性,该超流体对非相对论残余中微子捕获表现出显著的量子液体放大。

英文摘要:

The Cosmic Neutrino Background (C$ν$B) anisotropies for massive neutrinos are a unique probe of large-scale structure formation. The redshift-distance measure is completely different for massive neutrinos as compared to electromagnetic radiation. The C$ν$B anisotropies in massive neutrinos grow in response to non-relativistic motion in gravitational potentials seeded by relatively high $k$-modes. Differences in the early phases of large-scale structure formation in Warm Dark Matter (WDM) versus Cold Dark Matter (CDM) cosmologies have an impact on the magnitude of the C$ν$B anisotropies for contributions to the angular power spectrum that peak at high $k$-modes. We take the examples of WDM consisting of 2, 3 or 7 keV sterile neutrinos and show that the C$ν$B anisotropies for 0.05 eV neutrinos drop off at high-$l$ multipole moment in the angular power spectrum relative to CDM. At the same angular scales that one can observe baryonic acoustical oscillations in the CMB, the C$ν$B anisotropies begin to become sensitive to differences in WDM and CDM cosmologies. The precision measurement of high-$l$ multipoles in the C$ν$B neutrino sky map is a potential possibility for the PTOLEMY experiment with thin film targets of spin-polarized atomic tritium superfluid that exhibit significant quantum liquid amplification for non-relativistic relic neutrino capture.

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