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SUMMARY:Non-Gaussianity after Planck - Christian Byrnes (University of Sus
 sex)
DTSTART:20130610T120000Z
DTEND:20130610T130000Z
UID:TALK44373@talks.cam.ac.uk
CONTACT:Camille Bonvin
DESCRIPTION:Testing the Gaussianity of the primordial perturbations provid
 es a window on the early universe. Despite not detecting any new non-zero 
 parameters\, the Planck results have provided the most accurate measuremen
 ts ever about the physics of the early universe.\n\nI will reflect on thes
 e precision results and their implications for inflation\, as well as the 
 prospects for future measurements. In particular\, I will focus on the imp
 lications of the results on non-Gaussianity\, and what they might imply fo
 r the many other signatures that have not yet been searched for.\n\nFinall
 y I will discuss how one may probe the small scale perturbations. Even in 
 the “precision era” of cosmology\, measurements of the cosmic microwav
 e background and large scale structure only cover around three orders of m
 agnitude in length scales. Another 30 orders of magnitude in length scales
  must also have exited the horizon during inflation\, but these smaller sc
 ales remain unobserved. Primordial Black Holes (PBHs) can form in the earl
 y universe from the collapse of large density fluctuations. Tight observat
 ional limits on their abundance provide the best upper limit on the size o
 f the primordial fluctuations on small scales\, with PBHs only forming fro
 m extremely large and rare density fluctuations. The number of PBHs formed
  is therefore highly sensitive to small changes in the tail of the fluctua
 tions probability density function\, which probes non-Gaussianity.
LOCATION:CMS\, Pav.B\, CTC Common Room (B1.19)
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