BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Kristan Jensen (University of Victoria) DTSTART:20210407T123000Z DTEND:20210407T133000Z DTSTAMP:20260423T021411Z UID:SISSAHEP/7 DESCRIPTION:Title: Wormholes and black hole microstates in AdS/CFT\nby Kristan Jensen (U niversity of Victoria) as part of SISSA HEP seminars\n\n\nAbstract\nIt has long been known that the coarse-grained approximation to the black hole d ensity of states can be computed using classical Euclidean gravity. In thi s talk I will argue for another entry in the dictionary between Euclidean gravity and black hole physics\, namely that Euclidean wormholes describe a coarse-grained approximation to the energy level statistics of black hol e microstates. We do so by using the method of constrained instantons to o btain an integral representation of wormhole amplitudes in Einstein gravit y and in full-fledged AdS/CFT. These amplitudes are non-perturbative corre ctions to the two-boundary problem in AdS quantum gravity. The full amplit ude is likely UV sensitive\, dominated by small wormholes\, but it admits an integral transformation with a macroscopic\, weakly curved saddle-point approximation. The saddle is the "double cone" geometry of Saad\, Shenker \, and Stanford\, with fixed moduli. In the boundary description this sadd le appears to dominate a smeared version of the connected two-point functi on of the black hole density of states\, and suggests level repulsion in t he microstate spectrum. I will also discuss the stability of these wormhol es to small fluctuations and to brane nucleation. Our results indicate a f actorization paradox in AdS/CFT\, and I will discuss a potential mechanism for understanding it.\n LOCATION:https://researchseminars.org/talk/SISSAHEP/7/ END:VEVENT END:VCALENDAR