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Missing completely of the CMB quadrupole in WMAP data
  • ISSN号:1001-6538
  • 期刊名称:Chinese Science Bulletin
  • 时间:2013
  • 页码:1243-1249
  • 分类:P159[天文地球—天文学] N1[自然科学总论]
  • 作者机构:[1]Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China, [2]Department of Physics and Center for Astrophysics, Tsinghua University, Beijing 100084, China
  • 相关基金:supported by the National Basic Research Program of China(2009CB824800);the National Natural Science Foundation of China(11033003);the National Natural Science Foundation for Young Scientistsof China (11203024);the Youth Innovation Promotion Association,CAS
  • 相关项目:微波背景辐射数据分析与研究:宇宙学参数和早期宇宙演化
作者: 刘浩|李惕碚|
中文摘要:

在宇宙的微波,背景(CMB ) 试验,清洗前景的温度地图被剩余偶极子仍然由于 Doppler 偶极子方向和微波辐射计 sidelobe 的无常污染。获得可靠 CMB 地图,如此的污染不得不小心地从观察数据被移开。我们以前造了一个软件包裹为做地图,剩余偶极子污染移动,和从威尔金森微波 Anisotropy 探查(WMAP ) 的力量光谱评价未加工的数据。这个软件现在显著地被改进了。用改进软件,我们与 WMAP 未加工的数据获得 CMB 四极察觉的否定结果,哪个是 3.2 蒚裨? 韦芀最吗??

英文摘要:

In cosmic microwave background (CMB) experiments, foreground-cleaned temperature maps are still contaminated by the resid- ual dipole due to uncertainties of the Doppler dipole direction and microwave radiometer sidelobe. To obtain reliable CMB maps, such contamination has to be carefully removed from observed data. We have previously built a software package for map-making, residual dipole-contamination removal, and power spectrum estimation from the Wilkinson Microwave Anisotropy Probe (WMAP) raw data. This software has now been significantly improved. With the improved software, we obtain a negative result of CMB quadrupole detection with the WMAP raw data, which is -3.2±3.5 μK2 from the seven-year WMAP (WMAP7) data. This result is evidently incompatible with -1000 μK2 expected from the standard cosmological model ACDM. The completely missing of CMB quadrupole poses a serious challenge to the standard model and sets a strong constraint on possible models of cosmology. Due to the importance of this result for understanding the origin and early evolution of our universe, the software codes we used are opened for public checking.

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