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UID:MEC-851300ee84c2b80ed40f51ed26d866fc@community.kavlimeetings.org
DTSTART:20211208T020000Z
DTEND:20211208T030000Z
DTSTAMP:20211207T135600Z
CREATED:20211207
LAST-MODIFIED:20211207
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Factorizing Wormholes in a Partially Disorder-Averaged SYK Model
DESCRIPTION:\nTime:  10:00am  (UTC/GMT+8:00, Beijing/Shanghai), Dec. 8 (Wed.) , 2021\n\n\n\nZoom URL: https://us06web.zoom.us/j/82516408425?pwd=TmI3emNaUVR0RjZQUUpRSE9tcWE1Zz09 ( https://us06web.zoom.us/j/82516408425?pwd=TmI3emNaUVR0RjZQUUpRSE9tcWE1Zz09 )\n\n\n\nMeeting ID: 825 1640 8425\n\n\n\nPassword: 248437\n\n\n\nSpeaker: Kenta Suzuki (YITP)\n\n\n\nAbstract:\n\n\n\nWormhole geometry gives several nice features for gravitational path integral, but also leads to some puzzles. In the context of the AdS/CFT correspondence, one of the puzzles is the factorization problem, which is intimately related to ensemble averagingof the boundary theory.\n\n\n\nIn order to further study the nature of factorization in a simple set-up of the AdS/CFT correspondence, in this talk, we introduce a partially disorder-averaged SYK model. This model has a real parameter that smoothly interpolates between the ordinary totally disorder-averaged SYK model and the totally fixed-coupling model. For the large N effective description, in addition to the usual bi-local collective fields, we also introduce a new additional set of local collective fields.These local fields can be understood as “half” of the bi-local collective fields, and in the totally fixed-coupling limit, they represent the “half-wormholes” which were found in recent studies. We find that the large N saddles of these local fields vanish in the total-disorder-averaged limit, while they develop non-trivial profiles as we gradually fix the coupling constants. We argue that the bulk picture of these local collective fields represents a correlation between a spacetime brane and the asymptotic AdS boundary, and they play a crucial role for the factorization.\n
URL:https://kits.ucas.ac.cn/index.php/events/seminars/441-2021-seminar-fwpdasm
ORGANIZER;CN=(Kavli ITS) Kavli Institute for Theoretical Sciences | University of Chinese Academy of Sciences (UCAS):MAILTO:
CATEGORIES:Astrophysics,Theoretical Physics
LOCATION:Virtual
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