Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/10/026
Keywords
CMBR polarisation; Sunyaev-Zeldovich effect; CMBR experiments; galaxy surveys
Funding
- National Science Foundation [PHY-1607611]
- Horizon Fellowship from Johns Hopkins University
- Simons Foundation at the Aspen Center for Physics
- National Science and Engineering Research Council
- Perimeter Institute for Theoretical Physics
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- Province of Ontario through the Ministry of Research, Innovation and Science
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In this paper, we forecast the ability of future CMB and galaxy surveys to detect the kinetic polarized Sunyaev Zel'dovich (kpSZ) effect and introduce a quadratic estimator for the square of the peculiar velocity field based on a galaxy survey and CMB polarization. Furthermore, we outline how the kpSZ effect serves as a probe of cosmic birefringence and primordial non-Gaussianity, predicting the reach of future experiments.
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.
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