BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Victor Gorbenko DTSTART:20210407T160000Z DTEND:20210407T170000Z DTSTAMP:20260423T023009Z UID:UKYhepth/40 DESCRIPTION:Title: On QFT in de Sitter\nby Victor Gorbenko as part of Theoretical Physi cs Seminars (Kentucky)\n\n\nAbstract\nI will discuss the tools we are deve loping to calculate correlation functions of primordial inflationary pertu rbations. In this talk we will focus on the limit where gravitational exci tations are neglected and the cosmological spacetime is assumed to be exac tly de Sitter. Even in this simplifying limit\, which corresponds to a Qua ntum Field Theory on a de Sitter background\, very few examples of explici t analytic calculations exist and little is known about basic properties o f the correlators. I will show that for any dS QFT there exists a theory f ormulated in a Euclidean Anti-de SItter space and which reproduces all the correlation functions. This leads to major technical simplifications and allows to demonstrate various analytic properties of the cosmological obse rvables. Understanding of these properties has both phenomenological appli cations in inflation\, as well as provides some hints about more fundament al description for cosmological spacetimes.\n\nPasscode\, if needed: 1036 20\n LOCATION:https://researchseminars.org/talk/UKYhepth/40/ END:VEVENT END:VCALENDAR