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SUMMARY:Orthogonal non-Gaussianities from DBI Galileon inflation - Sébast
 ien Renaux-Petel\, DAMTP
DTSTART:20110610T120000Z
DTEND:20110610T130000Z
UID:TALK30989@talks.cam.ac.uk
CONTACT:Dr Sebastien Renaux-Petel
DESCRIPTION:We study the cosmology of the multifield relativistic Galileon
  model in which an induced gravity term is added to the Dirac-Born-Infeld 
 action. \nWe highlight the physical insight that is gained by employing a 
 bimetric perspective in which the induced gravity and Einstein-Hilbert act
 ion are treated on equal footing.\nWe derive the conditions under which a 
 phase of quasi exponential inflation can be sustained and demonstrate the 
 existence of a critical background energy density above which cosmological
  fluctuations become ghosts. At the non-linear level\, this scenario provi
 des the first concrete early Universe model in which the shape of the bisp
 ectrum can be predominantly of orthogonal type. More generally\, we show t
 hat the shape and sign of the primordial non-Gaussianities act as a powerf
 ul discriminant of the precise strength of the induced gravity. 
LOCATION:Pavilion B Potter Room (B1.19)
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