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The origin of the WMAP quadrupole | | Hao Liu
; Ti-Pei Li
; | | Date: |
4 Mar 2010 | | Abstract: | The cosmic microwave background (CMB) temperature maps from the Wilkinson
Microwave Anisotropy Probe (WMAP) are of great importance for cosmology. After
finding out significant systematics in official WMAP maps, we had developed our
own map-making software independently of the WMAP team. The new maps produced
from the WMAP raw data and our software are notably different to the official
ones, and the power spectrum as well as the best-fit cosmological parameters
are significantly different too. By revealing the inconsistency between the
WMAP raw data and their official map, we pointed out that there must exist an
unexpected problem in the WMAP map-making routine. Here we state that the
trouble comes from the inaccuracy of antenna pointing direction caused by
improper offset of the quaternion interpolation in the WMAP routine. The CMB
quadrupole in the WMAP release can be generated from a differential dipole
field which is completely determined by the spacecraft velocity and the antenna
directions without using any CMB signal. After correcting the WMAP team’s
error, the CMB quadrupole component disappears. Therefore, the released WMAP
CMB quadrupole is almost completely artificial and the real quadrupole of the
CMB anisotropy should be near zero. Our finding is important for understanding
the early universe. | | Source: | arXiv, 1003.1073 | | Services: | Forum | Review | PDF | Favorites | |
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