Princeton Algebraic Geometry Preprint Seminar

For information please contact Louis Esser or Junyao Peng.

The seminar meets Tuesdays from 4:30-5:30pm.

Room: Fine Hall 322.

Fall 2025

September 9th: Louis Esser: Nonrational varieties with unirational parametrizations of coprime degrees
September 16th: No seminar.
September 23rd: Supravat Sarkar: On the injective self-maps of algebraic varieties
September 30th: Jennifer Li: Birational geometry of Calabi-Yau pairs and 3-dimensional Cremona transformations
October 7th: Dhruv Goel: On the degree of a modular map
October 14th: Fall Recess
October 21st: John Sheridan
October 28th: Matt Larson
November 4th:
November 11th: Kimoi Kemboi
November 18th: Sung Gi Park:
November 25th: No Seminar
December 2nd: Chenyang Xu: Boundedness of some fibered K-trivial varieties

Spring 2025

February 4th: Kimoi Kemboi The D-equivalence conjecture for hyperkahler varieties via hyperholomorphic bundles
February 11th: Louis Esser: Group theoretical characterizations of rationality
February 18th: János Kollár: Néron models and minimal models
February 25th: No seminar.
March 4th: Junyao Peng: Threefolds of globally F-regular type with nef anticanonical divisor
March 11th: Spring Recess
March 18th: No seminar.
March 25th: Sho Tanimoto
April 1st: Sung Gi Park: Archimedean zeta functions, singularities, and Hodge theory
April 8th: Matt Larson: Algebra of global sections of \psi-bundles on \bar{M_{0,n}}
April 15th: Jinhyung Park
April 22nd: Justin Lacini: A transfer principle for unirationality
April 29th: Siqing Zhang: Derived derivations govern contraderived deformations of dg algebras over gd (pr)operads

Fall 2024

September 10th: No seminar -- special tea.
September 17th: Siqing Zhang The structure of the moduli of gauged maps from a smooth curve
September 24th: Louis Esser: Finite abelian groups acting on rationally connected threefolds I: Groups of product type
October 1st: Justin Lacini: Boundedness of log Fano cone singularities and discreteness of local volumes
October 8th: Longke Tang: Perfectoid pure singularities
October 15th: Fall Recess
October 22nd: John Sheridan: The second syzygy schemes of curves of large degree
October 29th: Supravat Sarkar: Threefolds containing all curves are rationally connected
November 5th: Junyao Peng: Effective Fujita-type theorems for surfaces in arbitrary characteristic
November 12th:Sung Gi Park: Differential forms and Hodge structures on singular varieties
November 19th: Bradley Dirks: Terminal threefold that are not Cohen--Macaulay
November 26th: Matt Larson: Nonnegativity of signed Euler characteristics of moduli of curves and abelian varieties
December 3rd: Haydee Lindo:Trace ideals and applications

Spring 2024

February 6th: Justin Lacini: MMP for locally stable families and wall crossing for moduli of stable pairs
February 13th: Louis Esser: Equivariant geometry of singular cubic threefolds (rescheduled)
February 20th: Longke Tang: A procdh topology
February 27th: Junyao Peng: Minimal log discrepancies on smooth threefolds
March 5th: Louis Esser: Equivariant geometry of singular cubic threefolds
March 12th: Spring recess.
March 19th: Burt Totaro: The birational automorphism group of P^n maps onto the integers for n at least 4
March 26th: Joe Waldron: Prismatic Kunz's theorem
April 2nd: Jennifer Li: Fibered Calabi-Yau threefolds with relative automorphisms of positive entropy and c_2-contractions
April 9th: Yueqiao Wu: Affine vs. Stein in rigid geometry
April 16th: Supravat Sarkar: Endomorphisms of Fano 3-folds and log Bott vanishing
April 23rd: János Kollár: Essential dimension of isogenies
April 30th: Shiyue Li:The wheel classes in the locally finite homology of GL_n(Z), canonical integrals and zeta values (canceled)

Fall 2023

September 19th: Longke Tang: Applications of perverse sheaves in commutative algebra
September 26th: Louis Esser: Symbols and equivariant birational geometry in small dimensions
October 3rd: Justin Lacini: Singularities and syzygies of secant varieties of nonsingular projective curves
October 10th: János Kollár: Fano varieties with torsion in the third cohomology group
October 17th: Fall Recess
October 24th: No seminar
October 31st: Siqing Zhang Coherently complete algebraic stacks in positive characteristic
November 7th: Hanlin Cai Hodge-Tate stacks and non-abelian p-adic Hodge theory of v-perfect complexes on rigid spaces
November 14th: John Sheridan: (canceled)
November 21st: Jennifer Li: Cone of divisors on P^3 blown up at eight very general points
November 28th: Supravat Sarkar: Fano 4-folds with nef tangent bundle in positive characteristic
December 5th: Shiyue Li: Bordifications of the moduli spaces of tropical curves and abelian varieties, and unstable cohomology of GL_g (Z) and SL_g (Z)

Spring 2023

January 31st: Zhiyuan Chen: Vanishing of (co)homology, freeness criteria, and the Auslander-Reiten conjecture for Cohen-Macaulay Burch rings
February 7th: Jennifer Li: A counterexample of Morrison's cone conjecture for a strict Calabi-Yau threefold
February 14th: Junyao Peng: Non-free sections of Fano fibrations
February 21st: Supravat Sarkar: Nowhere vanishing holomorphic one-forms on varieties of Kodaira codimension one
February 28th: No seminar.
March 7th: John Sheridan: On varieties of general type with many global k-forms
March 14th: Spring Recess
March 21st: Lu Qi: Differentiability of the relative χ-volume over an adelic curve
March 28th: Gleb Terentiuk: The period-index problem and Hodge theory
April 4th: No Seminar.
April 11th: Ziquan Zhuang: Non-Archimedean Green's functions and Zariski decompositions
April 18th: Shiji Lyu (canceled)
April 25th: Bogdan Zavyalov: Finite presentation of the tame fundamental group
TBD: Myeonhu Kim: On the perfection of algebraic spaces

Fall 2022

September 20th: John Sheridan: Geometric representability of 1-cycles on rationally connected threefolds
September 27th: Jennifer Li: The Topology of Calabi-Yau Threefolds
October 4th: Lu Qi: An estimate for F-jumping numbers via the roots of the Bernstein-Sato polynomial
October 11th: Erroxe Etxabarri-Alberdi: Birational involutions of the real projective plane
October 18th: Fall Recess
November 8th: Longke Tang: Motivic spectra and universality of K-theory
November 15th: Myeonhu Kim: The F-signature Function on the Ample Cone
November 22nd: Thanksgiving.
November 29th: Shiji Lyu: Perfectoid signature, perfectoid Hilbert-Kunz multiplicity, and an application to local fundamental groups
December 6th: János Kollár: Automorphisms of rings of invariants
December 13th: Yujie Luo: Logarithmic base change theorem and smooth descent of positivity of log canonical divisor

Spring 2022

January 25th: Joaquín Moraga
February 1st: Zhiyuan Chen
February 8th: Junyao Peng
February 15th: John Sheridan
February 22nd: Jennifer Li
March 1st: Shiji Lyu
March 8th: Spring Break
March 15th: No Seminar.
March 22nd: Fernando Figueroa
March 29th: No Seminar.
April 5th: No Seminar.
April 12th: Lu Qi
April 19th: Longke Tang
April 26th: Myeonhu Kim
May 3rd: Emelie Arvidsson

Fall 2021

September 7: John Sheridan
September 14: Joaquín Moraga
September 21: Fernando Figueroa
September 28: David Villalobos Paz
October 5: Takumi Murayama
October 12: Longke Tang
October 19: Fall Break
October 26: Jennifer Li
November 2: Lu Qi
November 9: Shiji Lyu
November 16: Junyao Peng
November 23: Myeonhu Kim
November 30: Emelie Arvidsson

Summer 2021

June 22: Joaquín Moraga
June 29: Fernando Figueroa
July 6: John Sheridan
July 13: Mihai Fulger
July 20: János Kollár
July 27: No seminar.
August 3: Kai Huang
August 10: Jennifer Li
August 17: Takumi Murayama
August 24: Chenyang Xu
August 31: Ziquan Zhuang

Spring 2021

January 12: Joaquín Moraga
January 19: Fernando Figueroa Zamora
January 26: David Villalobos Paz
February 2: Charles Stibitz
February 9: Tudor Padurariu
February 16: Kenneth Ascher
February 23: François Greer
March 2: Mihai Fulger
March 9: Emanuel Reinecke
March 16: Remy van Dobben de Bruyn
March 23: John Sheridan
March 30 : Takumi Murayama
April 6: Joaquín Moraga
April 13: Shiji Lyu
April 20: Kai Huang
April 27: János Kollár

Fall 2020

August 27: David Villalobos Paz
September 3: János Kollár
September 8: Fernando Figueroa Zamora
September 15: Joaquín Moraga
September 22: John Sheridan
September 29: Takumi Murayama
October 6: Emanuel Reinecke
October 13: Mihai Fulger
October 20: Gabriele Di Cerbo
October 27: Tudor Padurariu
November 3: Kai Huang
November 10: Shiji Lyu (Special Time: 16:30 Princeton Time)
November 17: François Greer
November 24: Yuchen Liu
December 1: Akash Sengupta

Fall 2025

Spring 2025

Fall 2024

Spring 2024

Fall 2023

Spring 2023

Fall 2022

Spring 2022

Fall 2021

Summer 2021

Spring 2021

Fall 2020

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