BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Sayantani Bhattacharyya (NISER\, India) DTSTART:20201208T150000Z DTEND:20201208T160000Z DTSTAMP:20260423T022932Z UID:HoloTube/29 DESCRIPTION:Title: Entropy current for higher derivative theories of gravity\nby Sayant ani Bhattacharyya (NISER\, India) as part of HoloTube: Applied holography webinars\n\n\nAbstract\nWe know that black holes could be viewed as thermo dynamic ensemble of large number of microstates and therefore we could ass ociate some entropy with these objects. For Einstein gravity\, the local a rea element around any point of the black hole horizon plays the role of e ntropy density\, that satisfies the second law of thermodynamics locally a t every point on the horizon. However\, any UV complete theory of gravity\ , in its low energy limit\, will typically have higher derivative correcti ons to Einstein gravity. Black holes continue to exist for such higher der ivative theories. In this talk\, we shall show that for such theories we c ould still satisfy the second law locally on every point of the horizon\, at least when the dynamics of the black hole is of small amplitude. To see this\, we need to add a spatial entropy current to the equilibrium constr uction of Wald entropy density. This method also fixes some of the ambigui ties that arise in Wald’s construction\, for the entropy of a dynamical black hole in higher derivative theories.\n LOCATION:https://researchseminars.org/talk/HoloTube/29/ END:VEVENT END:VCALENDAR