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SUMMARY:BPS Fivebrane Stars - Yoav Zigdon (University of Cambridge)
DTSTART:20240201T130000Z
DTEND:20240201T140000Z
UID:TALK211540@talks.cam.ac.uk
CONTACT:Jackson Fliss
DESCRIPTION:We consider half-BPS bound states of NS5 branes and fundamenta
 l strings in the AdS decoupling limit. We revisit a solution corresponding
  to an ensemble average of these bound states\, and find that the appropri
 ate duality frame for describing the near-source structure is NS5-P. The t
 ypical microstate is described by a ball of fivebranes whose radius is par
 ametrically much larger than the "stretched horizon" scale of the correspo
 nding black hole. We also investigate quantum fluctuations of metric compo
 nents in coherent states. We find that the fluctuations are small away fro
 m a tiny distance from the source\, comparable to the 6D Planck scale. Com
 paring this result with an analysis in the literature of fluctuations in t
 he maximally mixed state\, we conclude that the large fluctuations previou
 sly found for the latter are statistical rather than quantum in nature\, a
 nd that perturbative string theory provides an accurate description of the
 se backgrounds.
LOCATION:Potter Room\, DAMTP
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