May 01, 2026 | 11:00am - 12:15pm
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05/01/2026 11:00
05/01/2026 12:15
Princeton University High Energy Theory Seminar
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Topic: Fortuity in the D1D5 System
Speakers: Haoyu Zhang, University of Southern California
More: https://www.ias.edu/sns/events/princeton-university-high-energy-theory-seminar-50
ABSTRACT: Recent work has highlighted a sharp distinction among BPS
states in AdS/CFT at finite N: _fortuitous_ states, which cease to
be BPS as the gravitational coupling is decreased, in contrast
with _monotone_ states. Chang and Lin proposed that fortuitous
states account for the black hole entropy, while monotone states
account for the entropy of smooth horizonless geometries.
In this talk, I will review the notion of fortuity and test the
proposal by Chang and Lin in the D1–D5 system. Supersymmetric black
holes are known to obey non-trivial charge constraints. I will present
evidence that fortuitous states satisfy the same charge constraints as
the supersymmetric BMPV black hole.
Jadwin Hall, PCTS Room 407
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