BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Hao Geng (Harvard U.) DTSTART:20211214T140000Z DTEND:20211214T150000Z DTSTAMP:20260423T005706Z UID:FHD3/11 DESCRIPTION:Title: En tanglement Islands in Braneworlds\nby Hao Geng (Harvard U.) as part of Frontiers of Holographic Duality-3\n\n\nAbstract\nEntanglement island is a recently emergent concept playing an important role in resolving the bl ack hole information paradox. In these resolution proposals the black hole is coupled to a bath which absorbs the radiation from the black hole and we can calculate the entanglement entropy of the black hole radiation as a function of time by studying the bath. The results are consistent with Pa ge's argument that the entanglement entropy versus time diagram obeys unit arity-- a Page curve. In higher dimensions\, this calculation of the Page curve can be done only in braneworld models. More precisely\, the Karch-Ra ndall braneworld models and for AdS black holes. A closer look at the bra neworld models tells us that the graviton is massive as the massless gravi ton mode is not normalizable. However\, this effect of having a massive gr aviton is induced by coupling the black hole to a bath which is a universa l feature of all the resolution proposals in higher dimensions. Several at tempts to construct entanglement islands for massless gravity using branew orld give us many interesting new setups to study quantum gravity-- includ ing a codimension two holography in AdS (wedge holography) and Page curve for de Sitter radiation. Though these attempts didn't provide us with enta nglement islands for massless gravity in asymptotically AdS spaces. We wil l see that a more careful study tells us that in a large set of situations entanglement islands don't exist in massless gravity theories. In the tal k I will give a complete review of this line of research.\n LOCATION:https://researchseminars.org/talk/FHD3/11/ END:VEVENT END:VCALENDAR