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SUMMARY:Tom Bridgeland
DTSTART:20201110T150000Z
DTEND:20201110T160000Z
DTSTAMP:20260423T021231Z
UID:Freemath/28
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Freemath/28/
 ">Donaldson-Thomas invariants and a non-perturbative topological string pa
 rtition function</a>\nby Tom Bridgeland as part of Free Mathematics Semina
 r\n\n\nAbstract\nI will introduce a class of Riemann-Hilbert problems whic
 h (I claim) arise naturally in Donaldson-Thomas theory. I will start with 
 the simplest example (corresponding to the DT theory of the A1 quiver) whi
 ch leads via undergraduate mathematics to the gamma function. Then I will 
 explain how the same procedure applied to the DT theory of coherent sheave
 s on the resolved conifold leads to a non-perturbative version of the Grom
 ov-Witten generating series\, i.e. a particular choice of holomorphic func
 tion having this series as its asymptotic expansion (in fact the same resu
 lt holds for any non-compact CY threefold having no compact divisors). If 
 there is time left at the end (which there never is) I will discuss recent
  attempts to go beyond these results.\n
LOCATION:https://researchseminars.org/talk/Freemath/28/
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