BEGIN:VCALENDAR VERSION:2.0 PRODID:-//University of Utah Math Department//Algebraic Geometry Seminar//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Algebraic Geometry Seminar - Fall 2021 X-WR-CALDESC:Algebraic Geometry Seminar at University of Utah Mathematics Department X-WR-TIMEZONE:America/Denver BEGIN:VEVENT UID:20210928T153000-devlin-mallory@math.utah.edu DTSTART;TZID=America/Denver:20210928T153000 DTEND;TZID=America/Denver:20210928T163000 DTSTAMP:20260819T205508Z SUMMARY:Bigness of tangent bundles, differential operators, and reduction mod \(p\) (In-person talk) DESCRIPTION:Speaker: Devlin Mallory\, University of Utah\n\nSince Bernstein—Gelfand—Gelfand’s analysis of the ring of differential operators on the cone over an elliptic curve, geometric reasoning has provided one of the few known methods for the difficult algebraic problem of describing the differential operators on a singular ring in characteristic 0. … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT BEGIN:VEVENT UID:20211019T110000-adam-afandi@math.utah.edu DTSTART;TZID=America/Denver:20211019T110000 DTEND;TZID=America/Denver:20211019T120000 DTSTAMP:20260819T205508Z SUMMARY:Polynomiality of Hyperelliptic Hodge Integrals DESCRIPTION:Speaker: Adam Afandi\, University of Münster\n\nHyperelliptic Hodge integrals are a class of intersection numbers on the moduli space of hyperelliptic curves. Several mathematicians (Graber-Pandharipande, Cavalieri, Wise, Johnson-Pandharipande-Tseng) have investigated these intersection numbers in the past, and their work has made it apparent … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT BEGIN:VEVENT UID:20211102T153000-sarah-frei@math.utah.edu DTSTART;TZID=America/Denver:20211102T153000 DTEND;TZID=America/Denver:20211102T163000 DTSTAMP:20260819T205508Z SUMMARY:Reduction of Brauer classes on K3 surfaces DESCRIPTION:Speaker: Sarah Frei\, Rice University\n\nFor a very general polarized K3 surface over the rational numbers, it is a consequence of the Tate conjecture that the Picard rank jumps upon reduction modulo any prime. This jumping in the Picard rank is countered by a drop in the size of the Brauer group. In this talk, I will report on joint work … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT BEGIN:VEVENT UID:20211116T153000-jingjun-han@math.utah.edu DTSTART;TZID=America/Denver:20211116T153000 DTEND;TZID=America/Denver:20211116T163000 DTSTAMP:20260819T205508Z SUMMARY:On ACC for minimal log discrepancies for threefolds (In-person talk) DESCRIPTION:Speaker: Jingjun Han\, Johns Hopkins University\n\nThe minimal log discrepancy introduced by Shokurov is a basic invariant in birational geometry. Shokurov conjectured that the set of threefold minimal log discrepancies should satisfy the ascending chain condition. This conjecture has a close relation with the termination of flips in the minimal … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT BEGIN:VEVENT UID:20211130T153000-oishee-banerjee@math.utah.edu DTSTART;TZID=America/Denver:20211130T153000 DTEND;TZID=America/Denver:20211130T163000 DTSTAMP:20260819T205508Z SUMMARY:Filtration of cohomology via symmetric (semi)simplicial spaces DESCRIPTION:Speaker: Oishee Banerjee\, HCM Bonn\n\nInspired by Deligne’s use of the simplicial theory of hypercoverings in defining mixed Hodge structures we replace the indexing category ∆ by the symmetric simplicial category ∆S and study (a class of) ∆S-hypercoverings, which we call spaces admitting symmetric (semi)simplicial filtration . For … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT BEGIN:VEVENT UID:20211207T153000-alexander-perry@math.utah.edu DTSTART;TZID=America/Denver:20211207T153000 DTEND;TZID=America/Denver:20211207T163000 DTSTAMP:20260819T205508Z SUMMARY:Serre functors of semiorthogonal components * At 2:30pm we'll be having catered lunch + coffee in LCB 323, and will remain gathered for the talk at 3:30pm. DESCRIPTION:Speaker: Alexander Perry\, University of Michigan\n\nThe Serre functor of a triangulated category is one of its most important invariants, playing the role of the dualizing complex of a variety in noncommutative algebraic geometry. I will explain how to describe the Serre functors of many semiorthogonal components of varieties in terms of spherical … LOCATION:Zoom URL:http://math.utah.edu/agseminar/2021-fall/ END:VEVENT END:VCALENDAR