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TH Cosmo Coffee

Tests of fundamental symmetries through the CMB: from WMAP to Planck

by Dr. Alessandro Gruppuso (IASF Bologna)

Wednesday, 11 April 2012 from to (Europe/Zurich)
at CERN ( 4-2-011 - TH common room )
Description I will review the claimed Parity anomaly found in the TT spectrum by Kim and Naselsky in 2010. Using an optimal estimator and supported by realistic Monte-Carlo realizations we have confirmed this anomaly in WMAP 7 data. No anomalies have been found in the other spectra (EE,TE,BB and TB,EB) for the same data set. Planck capabilities are forecasted in probing Parity violations on low resolution maps. Details about the optimal estimator for the angular power spectra will be given. In addition I will review the current CMB constraints on the birefringence angle 'alpha', which is a standard tracer of CPT violations. I will focus on large angular scales of WMAP 7 data and provide a new constraint which is based on an optimal estimator for the angular power spectra. This has allowed to build, for the first time at low multipoles, an angular power spectrum for alpha in search of a possible scale dependence of the birefringence effect. Our findings are compatible with no detection at all angular scales probed here. We finally forecast the capabilities of Planck in tightening the present constraints.

Published Papers I will refer:

1. New Constraints on Parity Symmetry from a re-analysis of WMAP 7 low resolution power spectra. by Gruppuso, Finelli, Natoli, Paci, Cabella, De Rosa, Mandolesi, Published in MNRAS 411 (2011) 1445

2. WMAP 7 year constraints on CPT violation from large angle CMB anisotropies. by Gruppuso, Natoli, Mandolesi, De Rosa, Finelli, Paci Published in JCAP 02 (2012) arXiv:1107.5548 [astro-ph.CO]