Joint Harvard-CUHK-YMSC Differential Geometry Seminar


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November 10, 2021 3:00 am - 4:00 am
via Zoom Video Conferencing

Richard Thomas - Department of Mathematics, Imperial College London

will speak on:

Higher rank DT theory from rank 1

Fix a Calabi-Yau 3-fold X. Its DT invariants count stable bundles and sheaves on X. The generalised DT invariants of Joyce-Song count semistable bundles and sheaves on X. I will describe work with Soheyla Feyzbakhsh showing these generalised DT invariants in any rank r can be written in terms of rank 1 invariants. By the MNOP conjecture the latter are determined by the GW invariants of X. Along the way we also show they are determined by rank 0 invariants counting sheaves supported on surfaces in X. These invariants are predicted by S-duality to be governed by (vector-valued, mock) modular forms.


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**Please note time is HONG KONG TIME** (3 am EST)