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SUMMARY:Some new isocurvature directions - Daniel Grin (KICP\, University 
 of Chicago)
DTSTART:20131111T130000Z
DTEND:20131111T140000Z
UID:TALK47675@talks.cam.ac.uk
CONTACT:33215
DESCRIPTION:I will discuss two unexplored parts of isocurvature parameter 
 space.\nIn one\, the compensated isocurvature mode (a fluctuation in the c
 osmic\nbaryon fraction)\, the usual linear theory observables are hidden\,
  and\nthe model remains unconstrained using familiar analyses. Instead\, t
 he\nhypothesis can be tested using the CMB trispectrum (put alternatively\
 ,\nusing off-diagonal correlations). After developing the formalism\, I'll
 \ndescribe a WMAP search for such an isocurvature mode. I'll then\ndiscuss
  the possibility of probing ultra-light axions (ULAs) as a dark\nmatter/da
 rk energy candidate\, using CMB anisotropy observables\, the\nmatter power
  spectrum\, and in particular\, the imprint of isocurvature\nin a ULA. I w
 ill also spend some time discussing the technical\nchallenges that result 
 when implementing this possibility in a\nBoltzmann code or a Markov Chain 
 analysis.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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