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SUMMARY:Soft limits in the presence of spatial curvature - Jakub Supeł (U
 niversity of Cambridge)
DTSTART:20200228T130000Z
DTEND:20200228T140000Z
UID:TALK136270@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:Although on largest observable scales the universe is spatiall
 y flat to a very good approximation\, effects of nonzero curvature on prim
 ordial correlators could be enhanced in EFT of inflation with small speed 
 of sound. The leading order effects of curvature on the scalar power spect
 rum had been studied previously and we extended the analysis to the bi-spe
 ctrum. While the signal in the bi-spectrum is predicted to be much weaker 
 than the noise\, we found that the correction to P_zeta is on the verge of
  detectability given current constraints on Omega_K and c_s. In the second
  part of the talk\, I will discuss more theoretical aspects of curved univ
 erse correlators. We found that pure gauge modes are disconnected from the
  spectrum of physical modes and thus there are no standard soft theorems i
 n open (or closed) universe.
LOCATION:Pavilion B Potter Room (B1.19)
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