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Autumn Semester 2026

Date / Time Speaker Title Location
16 September 2026
13:30-15:00 		Prof. Dr. Joachim Jelisiejew
University of Warsaw
Details

Algebraic Geometry and Moduli Seminar

Title Concise secant varieties and what they are good for?
Speaker, Affiliation Prof. Dr. Joachim Jelisiejew, University of Warsaw
Date, Time 16 September 2026, 13:30-15:00
Location HG G 43
Abstract Tensors, or multilinear maps, are well-known classically, but relatively isolated from modern algebraic geometry. This is hopefully about to change. In the talk I will illustrate this new bridge and its benefits also for alg.geo. Some numbers, such as 588224, 161914176, or 20636043486 may appear. This is a joint work with Jakub Jagiella.
Concise secant varieties and what they are good for?read_more
HG G 43
* 18 September 2026
16:00-17:30 		Prof. Dr. Aaron Pixton
University of Michigan
Details

Algebraic Geometry and Moduli Seminar

Title The tautological ring of M25 is not Gorenstein
Speaker, Affiliation Prof. Dr. Aaron Pixton, University of Michigan
Date, Time 18 September 2026, 16:00-17:30
Location HG G 43
Zoom
The tautological ring of M25 is not Gorenstein
HG G 43
Zoom
* 25 September 2026
16:00-17:30 		Benjamin Ellis-Bloor
Northwestern University
Details

Algebraic Geometry and Moduli Seminar

Title Cobordism and the moduli of curves
Speaker, Affiliation Benjamin Ellis-Bloor, Northwestern University
Date, Time 25 September 2026, 16:00-17:30
Location HG G 19.2
Zoom
Abstract I will discuss the problem of expressing the cobordism class of Mbar_{0,n} as a polynomial in generators of the cobordism ring. With rational coefficients, a method was given by Coates and Givental. With integer coefficients, we will get a recursion by lifting the string equation, introduced by Witten, to algebraic cobordism in genus 0. This recovers known closed formulas for invariants of Mbar_{0,n} such as the Poincaré polynomials, and gives new closed formulas for invariants such as certain twists of the chi_y-genus. I will also explain how equivariant localization in cobordism can alternatively be used, and the outlook in higher genus.
Cobordism and the moduli of curvesread_more
HG G 19.2
Zoom
2 October 2026
16:00-17:30 		Prof. Dr. Ignacio Barros
University of Antwerp
Details

Algebraic Geometry and Moduli Seminar

Title Euler pairing and the tautological ring of moduli spaces of K3 surfaces
Speaker, Affiliation Prof. Dr. Ignacio Barros, University of Antwerp
Date, Time 2 October 2026, 16:00-17:30
Location HG G 43
Abstract I will present work in progress on a Lefschetz-type structure on the subring in Chow generated by special cycles. In particular, we can relate the kernel of the Lefschetz operator to the vanishing of certain L-functions and obtain lower bounds for the rank of the space of tautological cycles of degree up to 16. This is very much "in progress" and all human-generated, so there will be some discussion, questions, and confusion. It is all joint work with Laure Flapan and Riccardo Zuffetti.
Euler pairing and the tautological ring of moduli spaces of K3 surfacesread_more
HG G 43
7 October 2026
13:30-15:00 		Dr. Denis Nesterov
ETH Zürich
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Denis Nesterov, ETH Zürich
Date, Time 7 October 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
9 October 2026
16:00-17:30 		Daniel Holmes
IST Austria
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Daniel Holmes, IST Austria
Date, Time 9 October 2026, 16:00-17:30
Location HG G 43
Title T.B.A.
HG G 43
14 October 2026
13:30-15:00 		Dr. Denis Nesterov
ETH Zürich
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Denis Nesterov, ETH Zürich
Date, Time 14 October 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
16 October 2026
16:00-17:30 		Dr. Roberto Fringuelli
University of Pisa
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Roberto Fringuelli, University of Pisa
Date, Time 16 October 2026, 16:00-17:30
Location HG G 43
Title T.B.A.
HG G 43
21 October 2026
13:30-15:00 		Dr. Denis Nesterov
ETH Zürich
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Denis Nesterov, ETH Zürich
Date, Time 21 October 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
23 October 2026
16:00-17:30 		Dr. Sergej Monavari
University of Padua
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Sergej Monavari, University of Padua
Date, Time 23 October 2026, 16:00-17:30
Location HG G 43
Title T.B.A.
HG G 43
28 October 2026
13:30-15:00 		Dr. Claudia Stadlmayr
Université de Neuchâtel
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Claudia Stadlmayr, Université de Neuchâtel
Date, Time 28 October 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
4 November 2026
13:30-15:00 		Dr. Denis Nesterov
ETH Zürich
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Denis Nesterov, ETH Zürich
Date, Time 4 November 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
25 November 2026
13:30-15:00 		Dr. Sam DeHority
Yale University
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Dr. Sam DeHority, Yale University
Date, Time 25 November 2026, 13:30-15:00
Location HG G 43
Title T.B.A.
HG G 43
27 November 2026
16:00-17:30 		Prof. Dr. Hsian-Hua Tseng
Ohio State University
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Prof. Dr. Hsian-Hua Tseng, Ohio State University
Date, Time 27 November 2026, 16:00-17:30
Location HG G 43
Title T.B.A.
HG G 43
4 December 2026
16:00-17:30 		Prof. Dr. Tudor Pădurariu
University of Bonn
Details

Algebraic Geometry and Moduli Seminar

Title Title T.B.A.
Speaker, Affiliation Prof. Dr. Tudor Pădurariu, University of Bonn
Date, Time 4 December 2026, 16:00-17:30
Location HG G 43
Title T.B.A.
HG G 43

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