Speaker
Description
We study the E and B mode polarisation of the cosmic microwave background (CMB) originating from the transverse peculiar velocity of free electrons during reionisation and post reionisation era. Interestingly, apart from having a blackbody part, the spectrum also contains a Sunyaev Zel'dovich (SZ) type (y-type) distortion, which makes it distinguishable from primordial polarisation as well as from other secondary sources, such as gravitational lensing. Furthermore, it is also differentiable from other y-type signals such as from the thermal SZ effect as it involves polarised radiation. 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 measurement of the cosmological parameters.
