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SUMMARY:Non-gaussianity in general single field inflation - The Trispectru
 m - Federico Arroja (ICG\, University of Portsmouth)
DTSTART:20080516T120000Z
DTEND:20080516T130000Z
UID:TALK11086@talks.cam.ac.uk
CONTACT:David Seery
DESCRIPTION:We compute the fourth order action in perturbation theory for 
 scalar and second order tensor perturbations for a minimally coupled singl
 e field inflationary model\, where the inflaton's lagrangian is a general 
 function of the field's value and its kinetic energy. We obtain the fourth
  order interaction hamiltonian in two gauges\, the comoving gauge and the 
 uniform curvature gauge. Using the comoving gauge action we calculate the 
 trispectrum at leading order in slow-roll\, finding agreement with a previ
 ously known result in the literature. We point out that in general to obta
 in the correct leading order trispectrum one cannot ignore second order te
 nsor perturbations as previously done by others. The next-to-leading order
  corrections may become detectable depending on the shape and we provide t
 he necessary formalism to calculate them.
LOCATION:Pavilion B Potter Room (B1.19)
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