Neutrino Mass Inference from SZ Surveys
Neutrino Mass Inference from SZ Surveys
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SZ 巡天的中微子质量推断
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Y. Rephaeli
中科院分区：
文献类型：
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作者：
M. Shimon;S. Sadeh;Y. Rephaeli
宇宙中结构的增长始于辐射-物质相等的时候，这相当于0.4eV$的能量标度。所有暗物质演化的踪迹预计都对这个或更小尺度上的中微子质量很敏感。在这里，我们探索使用正在进行的SZ调查获得的星系团数量和功率谱来限制中微子质量的可能性。具体地说，我们预测了普朗克卫星和陆基SPT实验正在进行的测量以及拟议的EPIC卫星的测量能力，以根据各自的SZ测量确定中微子质量的有趣界限。我们还考虑了一个仅涉及数百美元的类似ACT的CMB实验{
M deg^{2}}$也探索调查区域和灵敏度之间的权衡，以及这可能对推断的中微子质量产生什么影响。我们发现，对于这样的实验，浅层测量比深度和低噪声扫描方案更可取。我们还发现，如果一个星系团的探测极限被设定在$5西格玛$显著水平，那么普朗克SZ调查的预测结果原则上可以用来确定总中微子质量，其($1西格玛$)不确定度为$0.28 eV$。这是普朗克CMB透镜测量预期极限的两倍。SPT和EPIC调查得出的相应上限分别为$sim 0.44 ev$和$sim 0.12 ev$。绘制一个200度的区域，ACT测量预计将达到0.61 eV的$1sigma$不确定度；将观测区域扩大到4000度将把不确定度降低到0.36 eV。
The growth of structure in the universe begins at the time of radiation-matter equality, which corresponds to energy scales of $sim 0.4 eV$. All tracers of dark matter evolution are expected to be sensitive to neutrino masses on this and smaller scales. Here we explore the possibility of using cluster number counts and power spectrum obtained from ongoing SZ surveys to constrain neutrino masses. Specifically, we forecast the capability of ongoing measurements with the PLANCK satellite and the ground-based SPT experiment, as well as measurements with the proposed EPIC satellite, to set interesting bounds on neutrino masses from their respective SZ surveys. We also consider an ACT-like CMB experiment that covers only a few hundred ${
m deg^{2}}$ also to explore the tradeoff between the survey area and sensitivity and what effect this may have on inferred neutrino masses. We find that for such an experiment a shallow survey is preferable over a deep and low-noise scanning scheme. We also find that projected results from the PLANCK SZ survey can, in principle, be used to determine the total neutrino mass with a ($1sigma$) uncertainty of $0.28 eV$, if the detection limit of a cluster is set at the $5sigma$ significance level. This is twice as large as the limits expected from PLANCK CMB lensing measurements. The corresponding limits from the SPT and EPIC surveys are $sim 0.44 eV$ and $sim 0.12 eV$, respectively. Mapping an area of 200 deg$^{2}$, ACT measurements are predicted to attain a $1sigma$ uncertainty of 0.61 eV; expanding the observed area to 4,000 deg$^{2}$ will decrease the uncertainty to 0.36 eV.