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SUMMARY:Primordial non-Gaussianities and Quasi-Single Field Inflation - Xi
 ngang Chen (DAMTP\, Cambridge)
DTSTART:20091202T141500Z
DTEND:20091202T151500Z
UID:TALK19992@talks.cam.ac.uk
CONTACT:Baojiu Li
DESCRIPTION:Cosmic microwave background provides valuable information on t
 he origin of\nthe Universe. Its two-point correlation function\, i.e. powe
 r spectrum\, has\nverified the basic predictions of the inflationary parad
 igm. Namely\, the\ndensity perturbations that seed the large scale structu
 re of the Universe\nare primordial\, and they are approximately scale-inva
 riant and\nGaussian. Nonetheless\, there are much more information in high
 er-point\ncorrelation functions\, i.e. non-Gaussianities\, which are the t
 argets of many\nmodern experiments. They encode the details of the inflati
 onary dynamics\,\nthus can help us to turn the paradigm into explicit mode
 ls. In this talk\, I\nwill first review how various interacting dynamics d
 uring inflation can be\nassociated with distinctive signatures in large pr
 imordial\nnon-Gaussianities. Then I will introduce the concept of quasi-si
 ngle field\ninflation models that predict a novel class of non-Gaussian si
 gnatures.
LOCATION:MR3\, Centre for Mathematical Sciences
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