Cosmology seminar: Flavien Vansyngel

Flavien Vansyngel is a Post-Doc at IAS, Orsay

Simulations of polarised Galactic foregrounds

One of the current major goal in experimental cosmology is the detection of the primordial B modes of the CMB polarisation. Present projects will have the sensitivity required to detect the signal predicted by the simplest models of inflation. Any detection will also involve separation from Galactic foregrounds. How can we quantify the confidence of foreground subtraction? To answer this question, there is a need for realistic simulations of polarised Galactic foregrounds, in order to test component separation methods.

I will present a method that allows the user to simulate multiple realisations of polarised dust emission. Maps of Stokes parameters are computed from a model of the Galactic magnetic field, which features a mean field and a random realisation of the turbulent field. The maps are then post-processed in order to match the two-point statistics observed in the data.

Organizer

Benjamin Racine
Published Nov. 4, 2015 10:21 AM - Last modified Nov. 15, 2015 12:45 PM