Confronting self-interacting neutrinos with the full shape of the galaxy power spectrum
Confronting self-interacting neutrinos with the full shape of the galaxy power spectrum
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DOI：
10.1103/physrevd.108.103535
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发表时间：
2023-09
影响因子：
5
通讯作者：
D. Camarena;F. Cyr-Racine;John Houghteling
中科院分区：
文献类型：
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作者：
D. Camarena;F. Cyr-Racine;John Houghteling
一种宇宙学场景，其中早期宇宙中微子自由流的开始被延迟，直到接近物质辐射相等的时代，这已被证明可以很好地拟合某些宇宙微波背景（CMB）数据，但在某种程度上不受普朗克 CMB 偏振数据的青睐。为了澄清这种情况，我们在本文中从星系功率谱的完整形状研究了这种情况下与 CMB 无关的约束。尽管这种情况预测线性物质功率谱会发生重大变化，但我们发现它可以很好地拟合星系功率谱数据。有趣的是，我们表明，与宇宙学标准模型相比，数据显示出对中微子自由流延迟开始的适度偏好，这是由轻度非线性尺度上的星系功率谱数据驱动的。这一结论得到了剖面似然和贝叶斯探索分析的支持，显示了结果的稳健性。与标准宇宙学范式相比，这种情况预测了银河系尺度上的结构将受到显着抑制。虽然我们的分析依赖于中微子自相互作用的最简单的宇宙学表示，但我们认为，这种中微子自由流动被延迟的持久且某种程度上一致的图景激发了对能够协调所有宇宙微波背景、大规模结构和实验室数据的粒子模型的探索。
A cosmological scenario in which the onset of neutrino free streaming in the early Universe is delayed until close to the epoch of matter-radiation equality has been shown to provide a good fit to some cosmic microwave background (CMB) data, while being somewhat disfavored by Planck CMB polarization data. To clarify this situation, we investigate in this paper CMB-independent constraints on this scenario from the Full Shape of the galaxy power spectrum. Although this scenario predicts significant changes to the linear matter power spectrum, we find that it can provide a good fit to the galaxy power spectrum data. Interestingly, we show that the data display a modest preference for a delayed onset of neutrino free streaming over the standard model of cosmology, which is driven by the galaxy power spectrum data on mildly non-linear scales. This conclusion is supported by both profile likelihood and Bayesian exploration analyses, showing robustness of the results. Compared to the standard cosmological paradigm, this scenario predicts a significant suppression of structure on subgalactic scales. While our analysis relies on the simplest cosmological representation of neutrino self-interactions, we argue that this persistent - and somehow consistent - picture in which neutrino free streaming is delayed motivates the exploration of particle models capable of reconciling all CMB, large-scale structure, and laboratory data.