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B modes: component separation using Gibbs sampling in the context of the SPIDER experiment

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Detecting B-modes due to inflationary gravitational waves in the polarization of the Cosmic Microwave Background is one of the greatest goals of modern observational cosmology. Many experiments have been designed to detect this weak signal, and upper limits are improving year by year. In fact, while B-modes have now been clearly observed, these are not of inflationary origin, but rather induced by late time effects. At large scales, the signal is most probably dominated by the galactic dust, whereas at small scale, it is due to gravitational lensing. In this talk I will give a general introduction to CMB polarization and B modes, and show some recent observational highlights. I will then review the problem of component separation, and present a recently developed method for joint estimation of cosmological parameters and astrophysical foregrounds. Finally, I will discuss how this may be applied to observations from the SPIDER balloon borne experiment.

This talk is part of the Cosmology Lunch series.

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Lecture Room 3, Judge Business School Bevin Room, Churchill College MR 11, Centre for Mathematical Sciences & Zoom (contact organiser for the zoom link)

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