## Math Calendar

Tuesday, March 28, 2023
11:00-12:00
HFG611
Special talk
Lars Kuehne
13:00-14:00
HFG611
Special talk
Shuntaro Yamagishi
15:00-16:00
KBG Atlas
Special talk
Remy van Dobben de Bruyn
17:00-18:00
KBG Atlas
Special talk
Fei Xie
Thursday, March 30, 2023
11:00-12:00
BBG214
Special talk
Seoyoung Kim
15:00-16:00
MIN201
Special talk
Sven Moller
17:00-18:00
MIN201
Special talk
Grigori Avramidi
Friday, March 31, 2023
14:30-15:30
KBG Atlas
Special talk
Michal Wrochna
16:30-17:30
KBG Atlas
Special talk
Viktoria Ozornova
Wednesday, April 5, 2023
13:30-14:30
HFG-409
AG Seminar talk
Fabian Reede (Hannover) - Line bundles on noncommutative algebraic surfaces

Abstract: Let X be a complex algebraic surface. Let A be a (noncommutative) coherent O_X-algebra whose generic stalk is a central division algebra. Then the pair (X,A) can be thought of as a noncommutative algebraic surface. This talk deals with the moduli space of line bundles on (X,A), i.e., of locally free A-modules of rank one, in the cases where X has Kodaira dimension zero or is Fano. It turns out that the moduli space can be compactified by adding torsion-free A-modules of rank one. We will study e.g. the smoothness of this compactification and the deformation theory of the sheaves involved. This is partly joint work with U. Stuhler and with N.Hoffmann.
AG seminar webpage: https://webspace.science.uu.nl/~marse004/ag_seminar.html
Thursday, April 13, 2023
16:00-17:00
HFG 611
Applied seminar - Artem Kaznatcheev
Friday, April 14, 2023
11:00-16:30
Min 0.09
Mark Kac seminar in mathematical physics and probability -- Konstantin Khanin (U Toronto) and Vanessa Jacquier (UU)
Speaker 1: Konstantin Khanin (U Toronto)

Time: 11-12.45

TitleThe KPZ problem and Statistics of Stochastic Flows

AbstractThe KPZ (Kardar-Parisi-Zhang) problem is an extremely active research area which was actively studied in the last 15 years.
In this talk we will discuss a geometrical  approach  to the problem of the KPZ Universality.
Instead of looking at the height (interface) function and Airy processes, we will focus on the statistics of shocks and points of concentration of mass. We will also discuss the connection with the problem of the coalescing Brownian motions and coalescing fractional Brownian motions.

Speaker 2: Vanessa Jacquier (UU)

Time: 14.15-16.00

TitleHomogeneous and not homogeneous nucleation in the three–state Blume–Capel model

AbstractWe study the metastable behavior of the stochastic Blume–Capel model evolving according to the Glauber dynamics with zero boundary conditions. We will show that, due to the three–state character of the Blume–Capel model, the metastability scenario proven for periodic boundary condition changes deeply when different boundary conditions are considered.

The Hamiltonian of the Blume–Capel model depends on the magnetic field $h$ and the chemical potential $\lambda$. We study the heuristic in the whole region $\lambda,h > 0$, where the chemical potential term equally favors minus and plus spins with respect to zeroes and the magnetic field favors plusesand disadvantages minuses with respect to the zeroes, and we compere our results with the Blume-Capel model with periodic boundary conditions. Then, we analyze in detail the region $\lambda>h>0$. In this region, we identify the unique metastable state $\underline{-1}$, we compute the energy barrier from $\underline{-1}$ to the stable state $\underline{+1}$, and we find an estimate for the asymptotic behavior of the transition time from the metastable to the stable state as $\beta\to\infty$, where $\beta$ is the inverse of the temperature.
Tuesday, April 18, 2023
16:00-17:00
HFG 611
MI talk
Christian Carrick - TBA
Wednesday, April 19, 2023
13:30-14:30
HFG-409
AG Seminar talk
Oliver Leigh - TBA
Thursday, April 20, 2023
11:00-13:00
Utrecht BBG077
TopICS
Constanze Roitzheim -TBA

Speaker: Constanze Roitzheim (Kent)

Title: TBA

Abstract: TBA
16:00-17:00
HFG 611
Applied Seminar- Alef Sterk (RUG)
Tuesday, April 25, 2023
16:00-17:00
HFG 611
MI talk
Álvaro del Pino Gomez - TBA
TBA
Wednesday, May 3, 2023
13:30-14:30
HFG-409
AG Seminar talk
Chia-Fu Yu - Arithmetic invariants on supersingular Ekedahl-Oort (EO) strata for g=4
Abstract: The supersingular locus is one of main interests in algebraic geometry in characteristic p, and can be described in terms of polarised flag type quotients (PFTQs) in the sense of Li and Oort. The description for g=3 is rather explicit and is exploited by Karemaker and Yobuko and myself for investigating the arithmetic invariants of supersingular abelian threefolds, namely, the endomorphism rings and automorphism groups of them, confirming Oort's conjecture for g=3. In this talk we shall explain a general method for investigating the arithmetic invariants on supersingular EO strata, and report the progress of the joint work with Karemaker for g=4.

AG seminar webpage: https://webspace.science.uu.nl/~marse004/ag_seminar.html
Tuesday, May 9, 2023
15:30-17:30
Nijmegen
TopICS
Renee Hoekzema - TBA
Speaker: Renee Hoekzema

Title: TBA

Abstract: TBA
Wednesday, May 10, 2023
11:30-12:30
TBD
AG Seminar talk
Thorsten Schimannek - TBA
Tuesday, May 23, 2023
16:00-17:00
HFG-611
UGC seminar
Andreas Ott (Karlsruhe Institute of Technology) - TBA
Thursday, May 25, 2023
11:00-13:00
Utrecht BBG077
TopICS
Scott Balchin - TBA
Speaker: Scott Balchin (MPIM)

Title: TBA

Abstract: TBA
Tuesday, June 20, 2023
16:00-17:00
HFG 611
MI talk
Yuqing Shi - TBA
TBA
Thursday, June 22, 2023
16:00-17:00
HFG 611
Applied Mathematics Seminar -- Elizaveta Rebrova (Princeton)
Title: TBA

Description:  TBA
Tuesday, June 27, 2023
16:00-17:00
HFG 611
UGC seminar
Leonhard Hochfilzer (Göttingen) - TBA