University of Cambridge > > Theoretical Physics Colloquium > Multipoint Correlators in Multifield Cosmology: formal structure and applications

Multipoint Correlators in Multifield Cosmology: formal structure and applications

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If you have a question about this talk, please contact Francesca Chadha-Day.

Connected N-point amplitudes in quantum field theory are enhanced by a factor of N! in appropriate regimes of kinematics and couplings, but the non-perturbative analysis of this for collider physics applications is subtle. We will start by briefly reviewing this effect and related developments in large-charge sectors of quantum field theory. We then resolve the question in the affirmative for N-point correlation functions of cosmological perturbations in multifield inflation, and comment on its application to primordial non-Gaussianity. We find that they are calculably N!-enhanced using a simple model for the mixing of the field sectors which leads to a convolution of their probability distributions. This effect leads to model-dependent but interesting prospects for enhanced observational sensitivity. Additional spinoffs include applications to primordial black hole production and a new inflationary model with a controlled resummation of derivative interactions.

This talk is part of the Theoretical Physics Colloquium series.

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