BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Philipp Höhn (OIST\, University College London) DTSTART:20201007T150000Z DTEND:20201007T160000Z DTSTAMP:20260423T022925Z UID:QG-AA/1 DESCRIPTION:Title: Pr oblem of time\, relational observables and quantum covariance\nby Phil ipp Höhn (OIST\, University College London) as part of Quantum Gravity Ac ross Approaches\n\n\nAbstract\nThe diffeomorphism symmetry of general rela tivity leads to the infamous problem of time\, haunting especially canonic al approaches to quantum gravity. The core question it raises is how to de fine quantum dynamics in a diffeomorphism-invariant context (in the absenc e of external references such as boundaries) and is intimately tied with t he more general question of what are observables in a background-independe nt quantum theory. Relational observables are one way of addressing these challenges. The underlying idea is to localize physical quantities of inte rest relative to other dynamical degrees of freedom\, chosen as a dynamica l reference system\, rather than a spacetime background. A comprehensive r elational picture then warrants covariance to be extended to changes of dy namical reference system. In this talk\, I will offer an overview over ach ievements and challenges of the relational approach\, as well as perspecti ves on quantum gravity arising therefrom.\n LOCATION:https://researchseminars.org/talk/QG-AA/1/ END:VEVENT END:VCALENDAR