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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3437
DTSTART:20150227T213000Z
DTEND:20150227T223000Z
DTSTAMP:20260313T105046Z
LAST-MODIFIED:20150224T134027Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Detection of B-mode polarization at 150GHz and degree angular 
 scales by BICEP2 and Keck Array\, Physics Department Colloquium\, Dr. 
 Clem Pryke\, University of Minnesota
DESCRIPTION:The theory of Cosmic Inflation postulates that our entire 
 observable universe was spawned from a quantum fluctuation in an incre
 dibly brief burst of hyper expansion. Inflation makes several predicti
 ons which appear to match features of the actual Universe in which we 
 find ourselves\, and\, in addition\, predicts that a background of gra
 vitational waves will exist which may produce a specific observable fe
 ature in the polarization pattern of the Cosmic Microwave Background -
  the long sought B-mode polarization. Using data from a specialized ra
 dio telescope called BICEP2 operating from the South Pole in Antarctic
 a our collaboration reported last year a highly significant detection 
 of B-modes at 150GHz and few degree angular scales. However in a recen
 tly submitted joint analysis with the Planck space mission we find tha
 t\, once an unexpectedly high level of polarized emission from dust gr
 ains in our own galaxy is taken into account\, there is not currently 
 significant evidence for a gravitational wave signal. I will describe 
 the background\, the results\, and the ongoing BICEP/Keck-Array experi
 mental program.
URL:https://www.physics.wisc.edu/events/?id=3437
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