DISCOVERY-HET-Seminar – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Calendar > 2011 > DISCOVERY-HET-Seminar


Speaker: Mona Frommert, U. Geneve

Title: The axis of evil - a polarization perspective

The low multipoles in the Cosmic Microwave Background are strongly
aligned, posing a challenge to the isotropy of the Universe. There is
an ongoing discussion about whether this alignment is simply due to
a chance fluctuation in the CMB temperature map, if it can be blamed
on local structures or on systematics in the measurement, or whether it is actually due to a preferred direction intrinsic to our Universe.
We address the first of these questions by looking at a complementary
dataset: if the alignment is also seen in a dataset which is
independent of the CMB temperature map, it is unlikely that it is
just a statistical flaw. We use the WMAP polarization data in order to
obtain such an independent dataset and search for the alignment in
the latter.