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- W2012859170 abstract "The low quadrupole of the cosmic microwave background (CMB), measured by the Cosmic Background Explorer (COBE) and confirmed by the Wilkinson Microwave Anisotropy Probe (WMAP), has generated much discussion recently. We point out that the well-known correlation between temperature and polarization anisotropies of the CMB further constrains the low-multipole anisotropy data. This correlation originates from the fact that the low-multipole polarization signal is sourced by the CMB quadrupole as seen by free electrons during the relatively recent cosmic history. Consequently, the large-angle temperature anisotropy data make restrictive predictions for the large-angle polarization anisotropy, which depend primarily on the optical depth for electron scattering after cosmological recombination, τ. We show that if current cosmological models for the generation of large-angle anisotropy are correct and the COBE/WMAP data are not significantly contaminated by non-CMB signals, then the observed C amplitude on the largest scales is discrepant at the ~99.8% level with the observed C for the concordant ΛCDM model with τ = 0.10. Using τ = 0.17, the preferred WMAP model-independent value, the discrepancy is at the level of 98.5%." @default.
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- W2012859170 date "2004-09-01" @default.
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- W2012859170 title "The Cosmic Microwave Background Quadrupole in a Polarized Light" @default.
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- W2012859170 doi "https://doi.org/10.1086/422496" @default.
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