Conferences
 
ICCUB Colloquia: Detection of B-mode polarization at degree angular scales using BICEP2
 
Location
Sala de Graus Antiga
Date
30/05/2014 - 30/05/2014
 
BICEP2 recently reported a detection of B-modes in the CMB polarization at degree angular scales.

This B-mode pattern is widely interpreted as the likely signature from primordial gravitational waves, consistent with those predicted to arise in the first 10^-34 seconds of the history of the universe, stretched from quantum to classical scales by the exponential expansion of cosmic inflation. BICEP2 is a CMB polarimeter that was specifically designed to search for the elusive signal from inflationary gravitational waves in the B-mode power spectra around l = 80. BICEP2 has accumulated 3 years of data from the South Pole from 2010 to 2012, integrating continuously on a low-foreground region of effective size 1% of the whole sky.

I will describe the experimental strategy, tests for foreground or systematics contamination, and results in the map and power spectra. The reported B-mode spectrum is well fit by a lensed-LCDM plus tensor theoretical model with tensor/scalar ratio r = 0.20 +0.07 -0.05 with r = 0 is strongly disfavored.
 
Attached Documents
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya