BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Eva Silverstein (Institute for Theoretical Physics\, Stanford Univ ersity\, California\, USA) DTSTART:20200528T150000Z DTEND:20200528T163000Z DTSTAMP:20260423T010926Z UID:QASTM/6 DESCRIPTION:Title: Mu ltipoint correlators in multifield cosmology: formal structure and applica tions\nby Eva Silverstein (Institute for Theoretical Physics\, Stanfor d University\, California\, USA) as part of Quantum Aspects of Space-Time and Matter\n\n\nAbstract\nConnected N-point amplitudes in quantum field th eory are\nenhanced by a factor of N! inappropriate regimes of kinematics a nd\ncouplings\, but the non-perturbative analysis of this for collider\nph ysics applications is subtle. We will start by briefly reviewing\nthis ef fect and related developments in large-charge sectors of\nquantum field th eory. We then resolve the question in the affirmative\nfor N-point correl ation functions of cosmological perturbations in\nmultifield inflation and comment on its application to primordial\nnon-Gaussianity. We find that t hey are calculably N!-enhanced using a\nsimple model for the mixing of the field sectors which leads to a\nconvolution of their probability distribu tions. This effect leads to\nmodel-dependent but interesting prospects for enhanced observational\nsensitivity. Additional spinoffs include applica tions to primordial\nblack hole production and a new inflationary model wi th a controlled\nresummation of derivative interactions.\n LOCATION:https://researchseminars.org/talk/QASTM/6/ END:VEVENT END:VCALENDAR