Princeton University High Energy Theory Seminar
Fortuity in the D1D5 System
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.
Date & Time
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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Location
Jadwin Hall, PCTS Room 407Speakers
Haoyu Zhang, University of Southern California