Cosmology from the kinetic polarized Sunyaev Zel'dovich effect. Issue 10 (1st October 2022)

• Record Type: Journal Article
• Authors: Hotinli, Selim C.; Holder, Gilbert P.; Johnson, Matthew C.; Kamionkowski, Marc
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2022:Issue 10(2022)
• Publication Date: 2022-10-01
• Subjects: CMBR polarisation -- Sunyaev-Zeldovich effect -- CMBR experiments -- galaxy surveys; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2022/10/026
• Languages: English
• ISSNs: 1475-7516

Abstract

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.