Cosmological observables and their analytic structure

Date(s): Friday 26th May 2023 (14:00-15:00)
Contact: Event Convenor Contact: Andrew.Spiers@nottingham.ac.uk
Description: Speaker's Name: Paolo Benincasa
Speaker's Affiliation: Niels Bohr Institute
Speaker's Research Theme(s): NCoG,Gravity
Abstract:
QFT in nearly dS space-times and, more generally in FRW backgrounds, allows us to describe correlations at the end of inflation. However, how to extract fundamental physics out of them is still a challange: we do not even know how fundamental pillars such as causality and unitarity of time evolution constrain it. In this talk I will review recent progress in the understanding of the analytic structure of cosmological observables. Such progress is based on a novel geometrical approach which provides on one side novel computational tools and on the other side novel insights on the physics encoded into them and its ties to the flat-space physics. I'll finally comment on the issue of infrared divergence and a proof of concept on the possibility of defining infrared safe observables in perturbation theory.
Particle Cosmology Seminar
Venue: A113 Cripps building
Online Conference Link: https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d

School of Mathematical Sciences

The University of Nottingham
University Park
Nottingham, NG7 2RD

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