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SUMMARY:Kristan Jensen (Univ. of Victoria)
DTSTART:20210226T181500Z
DTEND:20210226T191500Z
DTSTAMP:20260423T024831Z
UID:USC-HET/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/USC-HET/11/"
 >Euclidean Wormholes in AdS/CFT</a>\nby Kristan Jensen (Univ. of Victoria)
  as part of USC High Energy Theory Seminars\n\nLecture held in Zoom. (Norm
 ally) SSC 319 on University Park Campus (USC).\n\nAbstract\nEuclidean worm
 holes\, geometries that smoothly connect multiple asymptotic regions\, pos
 e a conundrum in the AdS/CFT correspondence. I will discuss the constructi
 on of certain “simple" wormholes in pure Einstein gravity with negative 
 cosmological constant\, and in IIB supergravity. These wormholes connect t
 wo asymptotic boundaries which have the topology of either a torus or a ci
 rcle times a sphere. In this setting there are no saddle points which smoo
 thly connect the two boundaries. Our approach is to then take Einstein gra
 vity or supergravity seriously as an effective field theory\, in which one
  sums over metrics\, and to attempt to study the off-shell gravity path in
 tegral over wormhole metrics. This problem is formally analogous to one in
  the Higgs phase of 4d gauge theories coupled to matter\, where the Higgs 
 vev forbids instanton solutions\, and yet the theory receives instanton-li
 ke non-perturbative corrections. In that setting it has been known since t
 he 80s that there are “constrained instantons” which are in a precise 
 sense the most important off-shell configurations for non-perturbative eff
 ects. Using similar methods\, we find the “most important” wormhole ge
 ometries\, which we then use to write a (formal) semiclassical approximati
 on to the sum over metrics of this sort. I will also discuss the perturbat
 ive and non-stability of these geometries\, and the tension they pose with
  the standard AdS/CFT dictionary.\n\nZoom Meeting ID: 913 2401 0873\n\nhtt
 ps://usc.zoom.us/j/91324010873\n
LOCATION:https://researchseminars.org/talk/USC-HET/11/
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