Multipoint correlators in multifield cosmology: formal structure and applications

Eva Silverstein (Institute for Theoretical Physics, Stanford University, California, USA)

28-May-2020, 15:00-16:30 (4 years ago)

Abstract: Connected N-point amplitudes in quantum field theory are enhanced by a factor of N! inappropriate 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.

general relativity and quantum cosmologyHEP - phenomenologyHEP - theoryquantum physics

Audience: researchers in the topic

( paper | video )


Quantum Aspects of Space-Time and Matter

Organizers: Sayantan Choudhury*, Johannes Knaute*
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