Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/10/056
Keywords
CMBR polarisation; reionization; Sunyaev-Zeldovich effect
Funding
- Department of Atomic Energy, Government of India [RTI 4002]
- Max Planck Partner Group at Tata Institute of Fundamental Research - Max -Planck -Gesellschaft
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This study investigates the E and B mode polarization of the cosmic microwave background (CMB) caused by the transverse peculiar velocity of free electrons, focusing on the reionisation history and its sensitivity to the signal. The results show that the E and B modes of y-type distortion provide a way to overcome the cosmic variance of primary CMB anisotropies and serve as an independent probe of cosmological parameters.
We study the E and B mode polarisation of the cosmic microwave background (CMB) originating from the transverse peculiar velocity of free electrons, at second order in perturbation theory, during the reionisation and post-reionisation eras. Interestingly, the spectrum of this polarised kinetic Sunyaev-Zeldovich (SZ) effect can be decomposed into a blackbody part and a y-type distortion. The y-distortion part is distinguishable from the primary E and B modes and also the lensing B modes. Furthermore, it is also differentiable from the other y-type signals, such as the thermal SZ effect, which are unpolarised. We show that this signal is sensitive to the reionisation history, in particular to how fast reionisation happens. The E and B modes of y-type distortion provide a way to beat the cosmic variance of primary CMB anisotropies and are an independent probe of the cosmological parameters. The blackbody component of the pkSZ effect would be an important foreground for the primordial tensor modes for tensor to scalar ratio r <= 3 x 10-5.
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