The International Center for Mathematical Sciences – Sofia (ICMS-Sofia)
at the
Bulgarian Academy of Sciences


ICMS Seminar

October 8, 2021, 3:30-5:30 pm

ICMS-Sofia, via Zoom

Sebastian Torres


Windows and the BGMN conjecture

Let $C$ be a smooth projective curve of genus at least 2, and let $N$ be the moduli space of semistable rank-two vector bundles of odd degree on $C$. We construct a semi-orthogonal decomposition in the derived category of $N$ conjectured by Belmans, Galkin and Mukhopadhyay and by Narasimhan. It has blocks of the form $D(C_d)$ where $C_d$ are $d$-th symmetric powers of $C$, and the semi-orthogonal complement to these blocks is conjecturally trivial.

In order to prove our result, we use the moduli spaces of stable pairs over $C$. Such spaces are related to each other via GIT wall crossing, and the method of windows allows us to understand the relationship between the derived categories on either side of a given wall.

This is a joint work with J. Tevelev.

Тhe lectures will be held via Zoom.