BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Hong Liu (MIT) DTSTART:20260303T193000Z DTEND:20260303T203000Z DTSTAMP:20260423T005703Z UID:nhetc/130 DESCRIPTION:Title: "Filtering" CFTs at large N: Euclidean Wormholes\, Closed Universes\, and Black Hole Interiors\nby Hong Liu (MIT) as part of NHETC Seminar\n\n\n Abstract\nDespite its successes\, the large-N holographic dictionary remai ns incomplete. Key features of gravitational path integrals--most notably Euclidean wormholes and the associated failure of factorization--lack a cl ear interpretation in the standard large-N framework. In this talk\, we di scuss a resolution of the puzzle by introducing a large-N filter\, which p rovides an intrinsic boundary definition of gravitational "averages\,'' an d a boundary explanation of the origin of wormholes as well as their ampli tudes. In addition\, we derive an infinite tower of inequalities constrain ing wormhole amplitudes. \n\nBeyond resolving factorization\, the large-N filter supplies a generalized framework from which richer Lorentzian space time structures can emerge\, including closed universes and black hole int eriors. We argue that both closed universes and black hole interiors are q uantum volatile\, and that an AdS spacetime entangled with a baby universe is likewise quantum volatile. This volatility may allow an observer in Ad S to infer the existence of the baby universe\, whereas for an infalling o bserver crossing a black hole horizon\, the ability to make measurements a fter may become fundamentally limited--even if they may not live long eno ugh to notice.\n LOCATION:https://researchseminars.org/talk/nhetc/130/ END:VEVENT END:VCALENDAR