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SUMMARY:Cosmic strings\, effective number of neutrinos\, gravity waves and
  the CMB - Urrestilla\, J (University of the Basque Country)
DTSTART:20121204T121000Z
DTEND:20121204T123000Z
UID:TALK41831@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We will report about recent work concerning cosmic defects\, g
 ravity waves and the CMB. On one hand\, we simulate a scaling network of c
 osmic defects\, and predict the background gravity wave emission coming fr
 om them. On the other\, we study degeneracies in the CMB data between cosm
 ic strings and gravity waves. When one tries to fit the CMB data with the 
 effective number of neutrinos as a free parameter\, the data prefers a hig
 her number effective neutrinos. There have been works suggesting that the 
 extra relativistic signal could come from gravity waves\, and those waves 
 could be created by cosmic defects. We perform a full analysis of the syst
 em taking into account the signal that such a network would create\, its e
 ffect into the effective number of neutrinos\, and how those parameters in
 terplay in trying to fit different probes of CMB and other cosmological da
 ta. \n
LOCATION:Seminar Room 1\, Newton Institute
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