Speaker: Nicolo Piazzalunga (BIMSA)
Time: 2025-12-10 14:00-16:00
Location: 1710, SIMIS
Zoom Meeting ID: 842 2742 9541 Passcode: SIMIS
摘要：
We present a string-theoretic approach to surface counting in local Calabi-Yau fourfolds via supersymmetric localization in topologically twisted four-dimensional gauge theories. The approach is based on a correspondence between PT1-stable pairs on local fourfolds and twisted quasimaps with fixed two-dimensional domain associated to the ADHM quiver.
For toric fourfolds, we derive a conjectural formula for the K-theoretic quasimap partition function via Coulomb branch localization. As a result, we obtain a prescription fixing all sign ambiguities in the equivariant computation of such invariants.
Based on 2508.11512 with E. Diaconescu.
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