相对论性粒子数和质量的同时约束
Simultaneous constraints on the number and mass of relativistic species
摘要：
粒子物理学和宇宙学的最新迹象表明，中微子的种类超过三种。在宇宙学分析中，对于固定的宇宙学参数，中微子质量和种类数的影响原则上可以被解开。然而，由于我们没有完美的标准λ冷暗物质模型参数的测量，中微子质量和物质数量之间仍然存在一些相关性，这两个参数都应该包括在分析中。结合了几个宇宙探测器的最新观测结果（宇宙微波背景、大尺度结构、膨胀率）得到N_eff=3.58（68% CL时+0.15/-0.16）（95%CL时+0.55/-0.53），中微子质量总和小于0.60 eV（95 CL），这是目前从包括两个参数的分析中对N_eff和M_nu的最强约束。对于N_eff >3的偏好现在处于2sigma水平。
英文摘要：
Recent indications from both particle physics and cosmology suggest the existence of more than three neutrino species. In cosmological analyses the effects of neutrino mass and number of species can in principle be disentangled for fixed cosmological parameters. However, since we do not have perfect measurements of the standard Lambda Cold Dark Matter model parameters some correlation remains between the neutrino mass and number of species, and both parameters should be included in the analysis. Combining the newest observations of several cosmological probes (cosmic microwave background, large scale structure, expansion rate) we obtain N_eff=3.58(+0.15/-0.16 at 68% CL) (+0.55/-0.53 at 95% CL) and a sum of neutrino masses of less than 0.60 eV (95 CL), which are currently the strongest constraints on N_eff and M_nu from an analysis including both parameters. The preference for N_eff >3 is now at a 2sigma level.
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