Wed, 21 Oct 2026
01:00
Exceptionally, this seminar will take place in Classroom C2.

ADHM Bundles and counting surfaces in Calabi--Yau fourfolds

Noah Dizep
(Heriot-Watt University, Edinburgh)
Abstract
The recent seminal work by Bae, Kool and Park establishes a DT type theory counting surfaces in Calabi--Yau fourfolds. I will present on joint work with R. Szabo on computing a variant of surface counts on CY4s using Diaconescu--Piazzalunga's technology of ADHM Bundles and Coulomb branch localization on a smooth, toric, projective surface.
 
We compute these enumerative invariants by computing the partition function of a topologically twisted Gauge theory similar in nature to Vafa--Witten's twist of 4d N=4 SYM. 
 
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