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SEQUENCE:0
UID:UW-Physics-Event-3840
DTSTART:20151020T203000Z
DTEND:20151020T213000Z
DTSTAMP:20260419T110744Z
LAST-MODIFIED:20151016T141358Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Galilean creation of the inflationary universe\, Theory Semina
 r (High Energy/Cosmology)\, Masahide Yamaguchi\, Tokyo Institute of Te
 chnology
DESCRIPTION:It has been pointed out that the null energy condition can
  be violated stably in some non-canonical scalar-field theories. This 
 allows us to consider the Galilean Genesis scenario in which the unive
 rse starts expanding from Minkowski spacetime and hence is free from t
 he initial singularity. We use this scenario to study the early-time c
 ompletion of inflation\, pushing forward the recent idea of Pirtskhala
 va et al. We present a generic form of the Lagrangian governing the ba
 ckground and perturbation dynamics in the Genesis phase\, the subseque
 nt inflationary phase\, and the graceful exit from inflation\, as oppo
 sed to employing the effective field theory approach. Our Lagrangian b
 elongs to a more general class of scalar-tensor theories than the Horn
 deski theory and Gleyzes-Langlois-Piazza-Vernizzi generalization\, but
  still has the same number of the propagating degrees of freedom\, and
  thus can avoid Ostrogradski instabilities. We investigate the generat
 ion and evolution of primordial perturbations in this scenario and sho
 w that one can indeed construct a stable model of inflation preceded b
 y (generalized) Galilean Genesis.
URL:https://www.physics.wisc.edu/events/?id=3840
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