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SUMMARY:Cody Long/Cumrun Vafa (Harvard)
DTSTART:20210419T190000Z
DTEND:20210419T200000Z
DTSTAMP:20260423T021445Z
UID:WHCGP/31
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/WHCGP/31/">N
 on-Holomorphic Cycles and Non-BPS Black Branes</a>\nby Cody Long/Cumrun Va
 fa (Harvard) as part of Western Hemisphere colloquium on geometry and phys
 ics\n\n\nAbstract\nWe discuss extremal non-BPS black holes and strings ari
 sing in M-theory compactifications on Calabi-Yau threefolds\, obtained by 
 wrapping M2 branes on non-holomorphic 2-cycles and M5 branes on non-holomo
 rphic 4-cycles. Using the attractor mechanism we compute the black hole ma
 ss and black string tension\, leading to a conjectural formula for the asy
 mptotic volumes of connected\, locally volume-minimizing representatives o
 f non-holomorphic\, even-dimensional homology classes in the threefold\, w
 ithout knowledge of an explicit metric. In the case of divisors we find ex
 amples where the volume of the representative corresponding to the black s
 tring is less than the volume of the minimal piecewise-holomorphic represe
 ntative\, predicting recombination for those homology classes and leading 
 to stable\, non-BPS strings. We also show how to compute the central charg
 es of non-BPS strings in F-theory via a near-horizon AdS3 limit in 6d whic
 h\, upon compactification on a circle\, account for the asymptotic entropy
  of extremal nonsupersymmetric 5d black holes (i.e.\, the asymptotic count
  of non-holomorphic minimal 2-cycles).\n
LOCATION:https://researchseminars.org/talk/WHCGP/31/
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