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Missing completely of CMB quadrupole in WMAP data | | Hao Liu
; Ti-Pei Li
; | | Date: |
26 Mar 2012 | | Abstract: | In cosmic microwave background (CMB) experiments, foreground-cleaned
temperature maps are still disturbed by the dipole contamination caused by
uncertainties of the dipole direction and microwave radiometer sidelobe. To
obtain reliable CMB maps, the dipole contamination has to be carefully removed
from observed data. We built and improve a software package for map-making with
dipole-contamination removing, and power spectrum estimation form the Wilkinson
Microwave Anisotropy Probe (WMAP) data. With the software we obtain a negative
result of CMB quadrupole detection with WMAP data, the amplitude of CMB
quadrupole is -3.2pm3.5 {mu}K^2 from the seven-year WMAP (WMAP7) data, which
is evidently incompatible with sim1000 {mu}K^2 expected from the standard
cosmological model LCDM. 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. | | Source: | arXiv, 1203.5720 | | Services: | Forum | Review | PDF | Favorites | |
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