Cosmology from the kinetic polarized Sunyaev Zel'dovich effect
arXiv:2204.12503 · doi:10.1088/1475-7516/2022/10/026
Abstract
The cosmic microwave background (CMB) photons that scatter off free electrons in the large-scale structure induce a linear polarization pattern proportional to the remote CMB temperature quadrupole observed in the electrons' rest frame. The associated blackbody polarization anisotropies are known as the polarized Sunyaev Zel'dovich (pSZ) effect. Relativistic corrections to the remote quadrupole field give rise to a non-blackbody polarization anisotropy proportional to the square of the transverse peculiar velocity field; this is the kinetic polarized Sunyaev Zel'dovich (kpSZ) effect. In this paper, we forecast the ability of future CMB and galaxy surveys to detect the kpSZ effect, finding that a statistically significant detection is within the reach of planned experiments. We further introduce a quadratic estimator for the square of the peculiar velocity field based on a galaxy survey and CMB polarization. Finally, we outline how the kpSZ effect is a probe of cosmic birefringence and primordial non-Gaussianity, forecasting the reach of future experiments.
24 pages, 11 figures, comments welcome, v2 matches the published version
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Cited by in corpus (8)
- Cosmic birefringence tomography with polarized Sunyaev Zel'dovich effect
- Subtracting the kinetic Sunyaev-Zeldovich effect from the cosmic microwave background with surveys of large-scale structure
- Transverse velocities and matter gradient correlations: a new signal and a new challenge to moving-lens analyses
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