BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Non-Gaussianity from preheating - Alex Chambers\, Imperial College
  (University of London)
DTSTART:20080307T130000Z
DTEND:20080307T140000Z
UID:TALK9575@talks.cam.ac.uk
CONTACT:David Seery
DESCRIPTION:If light scalar fields are present at the end of inflation\, t
 heir non-equilibrium dynamics such as parametric resonance or a phase tran
 sition can produce non-Gaussian density perturbations. I show how these pe
 rturbations can be calculated using non-linear lattice field theory simula
 tions and the separate universe approximation. In the massless preheating 
 model\, we find that some parameter values are excluded while others lead 
 to acceptable but observable levels of non-Gaussianity. This shows that pr
 eheating can be an important factor in assessing the viability of inflatio
 nary models.
LOCATION:Pavilion B Potter Room (B1.19)
END:VEVENT
END:VCALENDAR