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Event Number 3331
Thursday, April 17th, 2014
 NPAC (Nuclear/Particle/Astro/Cosmo) Forum
 Detection of degree angular scale Bmode polarization with BICEP2/Keck Array
 Time: 2:30 pm
 Place: 5280 Chamberlin Hall
 Speaker: Grant Teply, Caltech
 Abstract: The BICEP2 experiment is a cosmic microwave background (CMB) polarimeter specifically designed to search for the signal of inflationary gravitational waves in the Bmode power spectrum around l=80. BICEP2 observed from the South Pole for three seasons from 2010 to 2012. Using its full 3year CMB data set, we report an excess of Bmode power at the angular scales of interest, inconsistent with the null hypothesis at a significance of >5σ. The observed Bmode power spectrum is wellfit by a lensedLCDM + tensor theoretical model with tensor/scalar ratio r=0.20+0.07−0.05. We will describe the BICEP2 instrument, observing strategy, data analysis, and results. We will also describe Keck Array, a successor to BICEP2, which is actively collecting sky data at both 100 and 150 GHz at high sensitivity for improved constraints on galactic foregrounds.
 Host: Vandenbroucke
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