BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Branislav Nikolic (Cologne U.) DTSTART:20210204T143000Z DTEND:20210204T153000Z DTSTAMP:20260423T035939Z UID:CENTRA/29 DESCRIPTION:Title: Classical\, semiclassical\, and quantum aspects of higher derivative gravi tational actions\nby Branislav Nikolic (Cologne U.) as part of CENTRA Seminar\n\n\nAbstract\nWhat is the motivation for introducing gravitationa l actions containing quadratic curvature or other higher derivative terms in investigations of gravity? What is the classical and quantum interpreta tion of such actions and what are the prospects for their observational te sts?\nIn this talk we address these questions from one approach to quantum gravity: quantum geometrodynamics and its semiclassical limit. We shall d raw attention to some conceptual and mathematical inconsistencies that qua ntum geometrodynamics and exact classical quadratic curvature gravity suff er from. We emphasize how one must be very cautious with classical and qua ntum interpretation of higher-derivative actions\, if one wants to maintai n a semiclassical limit to quantum geometrodynamics that is consistent wit h quantum field theory in curved spacetime. \nWe hope to inspire the resea rchers to critically pursue this line of inquiry in other approaches to qu antum gravity and their semiclassical limit\, and especially to revisit th e classical interpretation of higher-derivative gravitational actions.\n LOCATION:https://researchseminars.org/talk/CENTRA/29/ END:VEVENT END:VCALENDAR