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- W2059635105 abstract "The cross-correlation between cosmic microwave background (CMB) temperature anisotropies and the large-scale structure (LSS) traced by the galaxy distribution, or sources at different wavelengths, is now well known. This correlation results from the integrated Sachs–Wolfe (ISW) effect in CMB anisotropies generated at late times due to the dark energy component of the Universe. In a reionized universe, electron scattering at low redshifts leads to a large-scale polarization contribution. In addition to the primordial quadrupole, involving anisotropies at the last scattering surface, the ISW quadrupole rescatters and contributes to the large angular scale polarization signal. Thus, in principle, the low multipole polarization bump in the E-mode should be correlated with the galaxy distribution. Unlike the CMB temperature–LSS correlation that peaks for tracers at low redshifts, due to the increasing visibility function, while the fractional ISW quadrupole is decreasing, with increasing redshift, the polarization–galaxy correlation peaks mostly at redshifts between 1 and 3. Under certain conditions, mostly involving a low optical depth to reionization if the Universe reionized at a redshift around 6, the cross-polarization–source signal is marginally detectable if all-sky maps of the large-scale structure at redshifts between 1 and 3 are available. If the Universe reionized at a redshift higher than 10, it is unlikely that this correlation will be detectable even with no instrumental noise all-sky maps. While our estimates do not guarantee a detection, unknown physics related to the dark energy uncertain issues related to the large angular scale CMB and polarization anisotropies, and uncertainties related to the reionization history of the Universe may motivate attempts to measure this correlation using upcoming CMB polarization E-mode maps and large-scale structure maps of the high-redshift universe with the Large Synoptic Survey Telescope and quasar catalogues, among others." @default.
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- W2059635105 date "2006-01-24" @default.
- W2059635105 modified "2023-10-03" @default.
- W2059635105 title "Searching for integrated Sachs–Wolfe effect beyond temperature anisotropies: CMB E-mode polarization–galaxy cross-correlation" @default.
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- W2059635105 doi "https://doi.org/10.1088/1475-7516/2006/01/018" @default.
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