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arXiv 1401.7597astro-ph.COhep-ph
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利用CMB和大尺度结构约束暗物质-中微子相互作用

Constraining Dark Matter-Neutrino Interactions using the CMB and Large-Scale Structure

Ryan J. Wilkinson, Celine Boehm, Julien Lesgourgues

摘要:

利用普朗克和大尺度结构实验的最新宇宙学数据,对暗物质和中微子的弹性散射截面进行了新的研究。我们发现最强的约束是由莱曼-α森林设定的,如果截面是常数,则给出sigma_{DM-neutrino} < 10^{-33}(m_DM/GeV)cm ^2;如果它与温度平方成比例,则给出当前的值sigma_{DM-neutrino} < 10^{-45}(m_DM/GeV)cm ^2。这是迄今为止对DM-中微子相互作用最强有力的限制,表明人们可以利用宇宙中物质的分布来探测暗(“不可见”)相互作用。此外,我们还发现,热MeV DM和一个恒定的弹性散射截面的情况下,自然预测(i)截断在莱曼α尺度的物质功率谱,(ii)N_eff ~ 3.5 +/- 0.4,(iii)H_0 ~ 71 +/- 3 km/s/Mpc和(iv)中微子质量的可能产生。

英文摘要:

We present a new study on the elastic scattering cross section of dark matter (DM) and neutrinos using the latest cosmological data from Planck and large-scale structure experiments. We find that the strongest constraints are set by the Lyman-alpha forest, giving sigma_{DM-neutrino} < 10^{-33} (m_DM/GeV) cm^2 if the cross section is constant and a present-day value of sigma_{DM-neutrino} < 10^{-45} (m_DM/GeV) cm^2 if it scales as the temperature squared. These are the most robust limits on DM-neutrino interactions to date, demonstrating that one can use the distribution of matter in the Universe to probe dark ("invisible") interactions. Additionally, we show that scenarios involving thermal MeV DM and a constant elastic scattering cross section naturally predict (i) a cut-off in the matter power spectrum at the Lyman-alpha scale, (ii) N_eff ~ 3.5 +/- 0.4, (iii) H_0 ~ 71 +/- 3 km/s/Mpc and (iv) the possible generation of neutrino masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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