BRAG – Brazilian Algebraic Geometry Seminar

Everyone is welcome to come to IMPA to attend the BRAG (Brazilian Algebraic Geometry Seminar) on Friday, June 13th, 2025. For those that cannot be at IMPA for this occasion, it will be possible to attend the seminar virtually. The link with coordinates will be sent by email to the BRAG seminar mailing list a few days before the seminar.

Program

15:00 – 16:00 BRT

Title: Higher rank DT/PT wall-crossing in Bridgeland stability.

Speaker: Marcos Jardim (Unicamp)

Abstract: We prove that the Gieseker moduli space of stable sheaves on a smooth projective threefold X of Picard rank 1 is separated from the moduli space of PT stable objects by a single wall in the space of Bridgeland stability conditions on X, thus realizing the higher rank DT/PT correspondence as a wall-crossing phenomenon in the space of Bridgeland stability conditions.

16:30 – 17:30 BRT

Title: Coble and Göpel varieties

Speaker: Daniele Faenzi (Université de Bourgogne)

Abstract: A. Coble defined around 1880 some very peculiar hypersurfaces having unusual properties with respect to abelian varieties of small dimension. These turn out to be related to moduli spaces of bundles on curves of low genus. Göpel varieties are moduli spaces of Coble hypersurfaces. Both these kinds of varieties are related to exceptional Lie groups via Vinberg’s theory and gradings of Lie algebras.

I will outline some properties of Coble (and hopefully Göpel) varieties generalizing these classical constructions via orbital degeneracy loci.
Work in progress with V. Benedetti, M. Bolognesi, L. Manivel.

Mailing list

To subscribe to the BRAG mailing list, please send an email to:
brag-seminar-request@lists.ime.unicamp.br with “subscribe” in the subject line.