arXiv 0704.32712007-04-25astro-phhep-ph

中微子质量和中微子与普朗克卫星相互作用的约束模型

Constraining Models of Neutrino Mass and Neutrino Interactions with the Planck Satellite

Alexander Friedland, Kathryn M. Zurek, Sergei Bashinsky

备注：: 25 pages, 16 figures, revtex

摘要：

在几类粒子物理模型中--从经典的马约龙模型到最近的晚中微子质量或质量变化中微子的场景--假设一个或多个中微子耦合到一个新的光标量场。由于这种耦合，早期宇宙中的中微子不是自由流动，而是形成自耦合流体，在宇宙微波背景和宇宙的大尺度结构中具有潜在的可观测特征。我们重新审视这种情况下，从目前可用的宇宙学数据的约束，并调查从普朗克卫星预期的灵敏度。在第一种情况下，我们发现灵敏度强烈依赖于使用哪一段数据。SDSS主样本数据，结合WMAP和其他数据，在大约3.5 $σ$的置信水平上不支持三个耦合中微子的情况，但也支持大量自由流动的中微子，最佳拟合值为5.2。如果物质功率谱取自SDSS大红星系样本，最佳拟合点有2.5个自由流动的中微子，但在$2σ$有三个耦合中微子的情况是允许的。相比之下，普朗克一个人在$4.2σ$置信水平上甚至会排除单个自耦合中微子，并将CMB时期的总辐射确定为$ΔN_ν^{eff} = ^{+0.5}_{-0.3}$（$1σ$误差）。我们调查的普朗克探测器的细节，这一结果的鲁棒性。这种对中微子自由流的敏感性意味着普朗克将能够探测质量变化的中微子参数空间的大区域。普朗克也可能对高达1 TeV的中微子质量产生规模敏感。

英文摘要：

In several classes of particle physics models -- ranging from the classical Majoron models, to the more recent scenarios of late neutrino masses or Mass-Varying Neutrinos -- one or more of the neutrinos are postulated to couple to a new light scalar field. As a result of this coupling, neutrinos in the early universe instead of streaming freely could form a self-coupled fluid, with potentially observable signatures in the Cosmic Microwave Background and the large scale structure of the universe. We re-examine the constraints on this scenario from the presently available cosmological data and investigate the sensitivity expected from the Planck satellite. In the first case, we find that the sensitivity strongly depends on which piece of data is used. The SDSS Main sample data, combined with WMAP and other data, disfavors the scenario of three coupled neutrinos at about the 3.5$σ$ confidence level, but also favors a high number of freely streaming neutrinos, with the best fit at 5.2. If the matter power spectrum is instead taken from the SDSS Large Red Galaxy sample, best fit point has 2.5 freely streaming neutrinos, but the scenario with three coupled neutrinos becomes allowed at $2σ$. In contrast, Planck alone will exclude even a single self-coupled neutrino at the $4.2σ$ confidence level, and will determine the total radiation at CMB epoch to $ΔN_ν^{eff} = ^{+0.5}_{-0.3}$ ($1σ$ errors). We investigate the robustness of this result with respect to the details of Planck's detector. This sensitivity to neutrino free-streaming implies that Planck will be capable of probing a large region of the Mass-Varying Neutrino parameter space. Planck may also be sensitive to a scale of neutrino mass generation as high as 1 TeV.

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