University of Cambridge > Talks.cam > DAMTP Friday GR Seminar > Soft limits in the presence of spatial curvature

Soft limits in the presence of spatial curvature

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If you have a question about this talk, please contact Nathan Johnson-McDaniel.

Although on largest observable scales the universe is spatially flat to a very good approximation, effects of nonzero curvature on primordial correlators could be enhanced in EFT of inflation with small speed of sound. The leading order effects of curvature on the scalar power spectrum had been studied previously and we extended the analysis to the bi-spectrum. 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 universe correlators. We found that pure gauge modes are disconnected from the spectrum of physical modes and thus there are no standard soft theorems in open (or closed) universe.

This talk is part of the DAMTP Friday GR Seminar series.

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