Kinosaki Algebraic Geometry Symposium 2026

Contribution List

1. Numerically and cohomologically trivial automorphisms of elliptic surfaces

Matthias Schütt (Leibniz Universität Hannover)

27/10/2026, 09:30

Numerically and cohomologically trivial automorphisms form a classical topic
in algebraic geometry, especially for algebraic surfaces. I will focus on the
case of complex elliptic surfaces of Kodaira dimension one, which features
some surprising results, also in view of past claims. Much of this will be
motivated by the instructive case of Enriques surfaces.
(Joint work with Catanese,...

2. Hybrid dynamics of cohomologically hyperbolic automorphisms of complex projective surfaces

Reimi Irokawa (NTT)

27/10/2026, 10:45

We study degenerating families of hyperbolic dynamics over complex projective
surfaces by means of the theory of hybrid spaces by Boucksom, Favre, and
Jonsson. For an analytic family of hyperbolic automorphisms
$\{f_t\colon X_t\to X_t\}_{t\in\mathbb{D}^*}$ over projective surfaces $X_t$
that is possibly meromorphically degenerating at the origin, we consider the
family of invariant...

3. Hodge–Tate splitting and Akizuki–Nakano vanishing in positive characteristic I

Ryo Ishizuka (Institute of Science Tokyo)

27/10/2026, 13:30

For smooth projective varieties in characteristic zero, Hodge-to-de Rham
spectral sequence degenerates and Akizuki--Nakano vanishing theorem holds.
However, both statements can fail in positive and mixed characteristic.
Deligne and Illusie proved that, for a smooth variety $X$ in characteristic
$p$ admitting a $W_2$-lifting and satisfying $p>\dim X$, de Rham complex
decomposes and this...

4. Hodge–Tate splitting and Akizuki–Nakano vanishing in positive characteristic II

Shou Yoshikawa (Institute of Science Tokyo)

27/10/2026, 14:45

Following the talk ``Hodge--Tate splitting and Akizuki--Nakano vanishing I'',
I will continue the discussion of Hodge--Tate splitting, focusing in
particular on examples and applications. I will present characterizations
of Hodge--Tate splitting for Fano and Calabi--Yau varieties, and discuss
when Hodge--Tate splitting is preserved under various algebraic
constructions, including...

5. Subtleties in the minimal model theory for log surfaces without assuming Q-factoriality or log canonicity

Nao Moriyama (Kyoto U.)

28/10/2026, 09:15

$\mathbb{Q}$-factoriality or log canonicity}
The minimal model program (MMP) and the abundance conjecture are central
problems in birational geometry. The MMP for log surfaces holds under
standard assumptions, such as $\mathbb{Q}$-factoriality or log canonicity.
In this talk, we show that the MMP for log surfaces fails in general. On
the other hand, intriguingly, we also mention that the...

6. Canonical torus action on symplectic singularities

Yuji Odaka (RIMS, Kyoto U.)

28/10/2026, 10:30

For symplectic singularities, we reveal the presence of intrinsic canonical
(local) action of $\mathbb{H}^*$ on each of them, where $\mathbb{H}$ is the
Hamilton quaternion, though conditionally for now. Its subaction of
$\mathbb{C}^*$ satisfies a certain canonicity
("K-polystability"/hyperKähler structure) which we explain. Weaker version
was predicted by Kaledin decades ago. Joint with...

7. On Kawamata–Viehweg and Lipman Vanishings

Shihoko Ishii (U. of Tokyo)

28/10/2026, 11:45

The birational Kawamata--Viehweg vanishing theorem (KVV for short) is known
to hold in considerable generality in equal characteristic zero. By contrast,
it fails in general in positive characteristic. Nevertheless, it may still
hold for certain types of birational morphisms.

In his 2008 paper in the Michigan Mathematical Journal, Lipman studied
sequences of blow-ups at closed points...

8. Infinitely many braid group orbits

Anya Nordskova (Kavli IPMU)

29/10/2026, 09:30

I will present an example of a smooth projective variety $X$ for which the
braid group action on the set of full exceptional collections in $D^b(X)$
is not transitive and in fact has infinitely many orbits. Although the idea
behind the construction is quite simple and the example is not at all
exotic, this is the first case where such non-transitivity has been observed
in the realm of...

10. The wild age of linear p-cyclic quotient singularities

Linghu Fan (Kavli IPMU)

29/10/2026, 10:45

In this talk, we consider the quotient singularities associated to some
special linear actions of finite groups without pseudo-reflections. In
characteristic $0$, the age grading on the group, which relies on the
existence of the primitive roots of unity, is useful to study the properties
of the quotient singularities. On the other hand, when the characteristic
$p$ is positive, the age...

9. Formal neighborhoods of curves in Calabi–Yau threefolds

Franco Rota (Université Paris-Saclay)

29/10/2026, 13:30

An important question in birational and enumerative geometry is that of
contractibility of curves in higher dimensional varieties. Motivated by
this, I will focus on rational curves in Calabi--Yau threefolds: the most
recent results in this direction tie contractibility with non-commutative
geometry and deformation theory, through a local model for the formal
neighborhood of the...

11. The Cautis–Logvinenko conjecture for 3-fold NCCRs

Alastair Craw (U. of Bath)

29/10/2026, 14:45

For a finite subgroup $G$ of $\operatorname{SL}(3,\mathbb{C})$, the
$G$-Hilbert scheme is a crepant resolution of the quotient singularity
$\mathbb{C}^3/G$, and the universal family induces a derived equivalence
between coherent sheaves on $G$-Hilb and $G$-equivariant coherent sheaves
on $\mathbb{C}^3$. In 2009, Cautis and Logvinenko conjectured that this
equivalence sends the simple...

12. Shifted Lagrangian classes

Hyeonjun Park (KIAS)

30/10/2026, 09:15

Modern enumerative invariants, such as Gromov--Witten invariants and
Donaldson--Thomas invariants, are defined through the virtual classes.
In this talk, I will introduce Lagrangian classes, whose existence was
conjectured by Joyce, as a generalization of the virtual classes via shifted
symplectic geometry. As applications, I will explain the construction of
(1) cohomological Hall...

13. Supersymmetry, differential operators of infinite order and theta functions

Mikhail Kapranov (Kavli IPMU)

30/10/2026, 10:30

Differential operators of infinite order (DOI) are series in derivatives
which converge and define local operators of analytic functions. For
example, $\exp(d/dx)$ is not allowed but $\cos\sqrt{d/dx}$ is. Starting
from 1972, Sato, Kashiwara, Kawai, Takei, Yoshida and others developed a
characterization of $\theta(T)$, the Riemann theta-zerovalue, by a system
of DOI in modular variables...

14. [Poster] A rationality criterion for surfaces over real closed fields

Hayato Takagi (Nagoya university)

17. [Poster] A_1-type Lattice Convex Polyhedra

Kazuki Hamada (Tokyo Metropolitan University)

31. [Poster] Algebraic Stability conditions

Tianle Mao (Kavli IPMU)

23. [Poster] Chow Quotient Moduli Spaces of Algebraic Dynamical Systems

Rin Gotou (The University of Tokyo)

28. [Poster] Chow Theory of Non-strict Toric Stacks

Sota Suzuki (The University of Osaka)

29. [Poster] Classification of Paired Singular Fiber Structures of Elliptic K3 Surfaces

Sou Toshima (Hokkaido University)

38. [Poster] Critical cohomology of homogeneous LG pairs

Konstantin Aleshkin (Kavli IPMU)

22. [Poster] Deformations of Double Covers of P^3

Phin-sing Soo (The University of Tokyo)

26. [Poster] Degree-Zero DT4 Theory of Local Calabi–Yau Fourfolds over Surfaces

Shion Sawa (The University of Tokyo)

19. [Poster] Dormant Modular Curves: Chern Characters and a Genus Formula

Kohei Aoyama (The University of Osaka)

34. [Poster] Exceptional loci of F-blowups

Yutaro Kaijima (The University of Osaka)

30. [Poster] Finiteness of leaps of modules of integrable derivations

Takuya Miyamoto (The University of Tokyo)

24. [Poster] Frobenius morphisms in log geometry

Ryoma Takeuchi (Institute of Science Tokyo)

15. [Poster] Geometric Manin's conjectures and points counting on moduli space of curves

Hu Xiaolong (Nagoya University)

32. [Poster] K-stability of prime $\mathbb{Q}$-Fano 3-fold weighted complete intersections

Yuki Morita (The University of Tokyo)

39. [Poster] McKay correspondence for d-representation infinite algebras

Darius Dramburg (Kavli IPMU)

25. [Poster] Non-nef loci in mixed characteristic

Ryotaro Iwane (The University of Tokyo)

16. [Poster] On Flips and Flops Derived from GIT Quotients

Hung-Pin Chang (Nataional Taiwan University)

37. [Poster] On q-Witt dualizing complexes and some properties

Yuto Yamada (Institute of Science Tokyo)

33. [Poster] Quotients by $(p-1)/p$-adjoint klt foliations on surfaces

Yutaro Hiroi (The University of Osaka)

21. [Poster] Rational curves on del Pezzo varieties in positive characteristic

Natsume Kitagawa (Nagoya University)

20. [Poster] Shioda Heights and Wilson Loops

Lutian Zhao (Kavli IPMU)

18. [Poster] Space of prime congruences in tropical geometry

Kentaro Tanaka (Nagoya University)

35. [Poster] Symmetries of Toric Varieties over Fields of Characteristic Zero

Yutaro Naito (Nagoya University)

36. [Poster] The relative cone of curves of successive blowups

Yuto Masamura (The University of Tokyo)

27. [Poster] Variations of King Stability and Bridgeland Stability for Dihedral Reflection Groups

Shu Nimura