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SUMMARY:Non-Gaussian gravitational waves from inflation - Eiichiro Komatsu
 (MPIA)
DTSTART:20190527T120000Z
DTEND:20190527T130000Z
UID:TALK121369@talks.cam.ac.uk
CONTACT:76912
DESCRIPTION:It has been widely assumed that detection of primordial gravit
 ational waves from inflation in\, for example\, B-mode polarisation of the
  cosmic microwave background\, immediately implies discovery of the quantu
 m nature of spacetime. While this statement is true for the vacuum solutio
 n (left hand side of Einstein's equation)\, it does not apply if the gravi
 tational waves originate from the matter fields (right hand side). How can
  we distinguish between these two origins? The answer is non-Gaussinaity. 
 We show that the gravitational waves from SU(2) gauge fields coupled to a 
 spectator axion field during inflation are highly non-Gaussian with a char
 acteristic shape\, whereas those from the vacuum are only weakly non-Gauss
 ian. We end this talk by reviewing the current and upcoming experimental l
 andscape\, including the space mission proposal LiteBIRD.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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