Center for Complex Geometry

Chang-Yeon Chough, Introduction to algebraic stacks, V, VI
2023-07-25 15:00 - 17:30 (Asia/Seoul) | B236-1, IBS, Korea, Republic of
Speaker

Chang-Yeon Chough
Sogang Univ.

This is an 8 hours long lecture series on algebraic stacks, which have become an important part of algebraic geometry (for example, in the study of moduli spaces) since Deligne and Mumford established the foundation of the theory of stacks. This crash course will be following roughly “Algebraic Spaces and Stacks” by Martin Olsson. Our main goal is to set up a foundation for the theory of algebraic stacks, so that the attendees would be able to use it in their own research in the future.

Chang-Yeon Chough, Introduction to algebraic stacks, VII, VIII
2023-07-26 10:00 - 12:15 | B236-1, IBS, Korea, Republic of

Gunhee Cho, Non-measure Hyperbolicity of K3 and Enriques Surfaces
2023-08-03 16:00 - 17:00 | B266, IBS, Korea, Republic of
Speaker

Gunhee Cho
UCSB

By exploiting the upper semicontinuity of the Kobayashi-Eisenman pseudo volume (and pseudometric) under deformations of complex structures, we establish the non-measure hyperbolicity of K3 surfaces—which M. Green and P. Griffiths verified for certain cases in 1980—holds for all K3 surfaces. Our result provides a stronger condition than the Kobayashi non-hyperbolicity for any complex K3 surface, which had been demonstrated by L. Kamenova, S. Lu, and M. Verbitsky. An interesting consequence is the non-measure hyperbolicity of Enriques surfaces. This is the joint work with David R. Morrison.

Minseong Kwon, Spherical Geometry of Hilbert Schemes of Conics in Adjoint Varieties
2023-08-07 14:00 - 14:50 | B266, IBS, Korea, Republic of
Speaker

Minseong Kwon
KAIST

For each rational homogeneous space, the space of lines is now well-understood and can be described in terms of the induced group action. It is natural to consider rational curves of higher degree, and in this talk, we discuss geometry of conics in adjoint varieties, which are rational homogeneous spaces associated to simple Lie algebras. Each adjoint variety is equipped with a hyperplane distribution called the contact distribution, and we show that smooth conics transverse to the contact distribution form a homogeneous symmetric variety if the adjoint variety is of Picard number 1. This enables us to view the Hilbert scheme of conics as a spherical variety, and we compute its colored fan by using the description of the space of lines and the Hilbert-Chow morphism.

Kyeong-Dong Park, K-stability of Fano Spherical Varieties, I
2023-08-07 15:00 - 16:30 | B266, IBS, Korea, Republic of
Speaker

Kyeong-Dong Park
Gyeongsang National University

The aim of this seminar is to provide participants with a comprehensive understanding of the paper “K-stability of Fano spherical varieties” by Thibaut Delcroix. For a reductive algebraic group G, a normal G-variety is called spherical if it contains an open B-orbit, where B is a fixed Borel subgroup of G. The class of spherical varieties contains several important families which were studied independently, for example, toric varieties, rational homogeneous varieties, group embeddings, horospherical varieties, symmetric varieties, and wonderful varieties. They are classified by combinatorial objects called colored fans, which generalize the fans appearing in the classification of toric varieties. We discuss Delcroix’s combinatorial criterion for K-stability of a smooth Fano spherical variety in terms of the barycenter of its moment polytope with respect to the Duistermaat-Heckman measure and data associated to the corresponding spherical homogeneous space.
(1) Spherical varieties, colored fans, and algebraic moment polytopes
(2) Criterion for K-stability of Fano spherical varieties and its applications
(3) Equivariant test configurations with horospherical central fiber, and modified Futaki invariant

Kyeong-Dong Park, K-stability of Fano Spherical Varieties, II
2023-08-08 10:30 - 12:00 | B266, IBS, Korea, Republic of

Kyeong-Dong Park, K-stability of Fano Spherical Varieties, III
2023-08-08 15:00 - 16:30 | B266, IBS, Korea, Republic of

KSCV Workshop #26
2023-08-16 - 2023-08-18 | B109, IBS, Korea, Republic of
Speakers
Taeyong Ahn (Inha University)
Ye-Won Luke Cho (Pusan National University)
Young-Jun Choi (Pusan National University)
Pham Hoang Hiep (Vietnam Academy of Science and Technology)
Dinh Tuan Huynh (Hue University of Education-Hue University)
Łukasz Kosiński (Jagiellonian University)
Kang-Hyurk Lee (Gyeongsang National University)
Man-Chun Lee (The Chinese University of Hong Kong)
Hoseob Seo (Institute for Basic Science)
Guolei Zhong (Institute for Basic Science)
Abstracts
PDF File
Schedule
Day 1: August 16 (Wednesday)

~10:00
Registration

10:00~11:00
Kang-Hyurk Lee
The method of potential rescaling and a characterization of the unit ball

11:00~11:30
Coffee Break

11:30~12:30
Dinh Tuan Huynh (online)
Universal entrie curves in projective spaces with slow growth

12:30~14:30
Lunch

14:30~15:30
Taeyong Ahn
Equidistribution of positive closed currents on a compact Kähler manifold

15:30~16:00
Coffee Break

16:00-17:00
Guolei Zhong
Compact Kähler threefolds with the action of an abelian group of maximal dynamical rank

18:00~20:00
Speakers Dinner

Day 2: August 17 (Thursday)

10:00~11:00
Young-Jun Choi
An injectivity theorem on snc compact Kähler spaces

11:00~11:30
Coffee Break

11:30~12:30
Pham Hoang Hiep (online)
Singularity invariants of plurisubharmonic functions

12:30~14:30
Lunch

14:30~15:30
Man-Chun Lee
Kähler-Ricci flow on non-compact manifolds and application

15:30~16:00
Coffee Break

16:00-17:00
Ye-Won Luke Cho
Continuity of singular Kähler-Einstein potentials

17:30-19:00
Banquet

Day 3: August 19 (Friday)

10:00~11:00
Hoseob-Seo
Ohsawa measures on singular hypersurfaces and its applications

11:00~11:30
Coffee Break

11:30~12:30
Łukasz Kosiński
A Gehring-Hayman inequality

Organizers
Dano Kim (Seoul National University)
Sung-Yeon Kim (Institute for Basic Science)
N. Cuong Nguyen (Korea Advanced Institute of Science and Technology)
Aeryeong Seo (Kyungpook National University)
Venue
B109, IBS, Korea
Registration
Please submit Google form by July 28.
More Information
• How to get to IBS-CCG
• From Hotel to IBS
• IBS Cafeteria (Lunch)
Participants
Sui-Chung Ng (East China Normal University)
Bou Kang (KAIST)
Mario Chan (Pusan National University)
Jisoo Byun (Kyungnam University)
Hoseob Seo (Institute for Basic Science)
Sungmin Yoo (Incheon National University)
Seungjae Lee (Institute for Basic Science)
Han-Wool Lee (Korea University)
Hanjin Lee (Handong Global University)
Jiwon Jeong (Pusan National University)
Ye-Won Luke Cho (Pusan National University)
Boo Rim Choe (Korea University)
Hyunil Choi (Pusan National University)
Jihun Yum (Institute for Basic Science)
Kang-Hyurk Lee (Gyeongsang National University)
Do young Choi (KAIST)
Kang-Tae Kim (POSTECH)
Chiwon Yoon (KAIST)
Supported by Institute for Mathematical Convergence, KNU

Takayuki Koike, On Some Variants of Ueda's Lemma and its Application
2023-09-05 16:00 - 17:00 | on-line
Speaker

Takayuki Koike
(Osaka Metropolitan University)

In this talk, we explain our results on some variants of Ueda’s lemma on L∞-estimates for Cech coboundary operators that hold uniformly for all flat holomorphic line bundles on compact Kähler manifolds. This talk is partially based on joint work with Y. Hashimoto and T. Uehara.Title : Non-measure hyperbolicity of K3 and Enriques surfaces.

George Hitching, Brill-Noether Loci on Moduli Space of Symplectic Bundles over a Curve
2023-09-06 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

George Hitching
Oslo Metropolitan University

Let C be a smooth projective curve of genus g. The symplectic Brill-Noether locus S(k, 2n, K) parametrises stable bundles of rank 2n over C with at least k independent sections, and which admit a nondegenerate skewsymmetric bilinear form with values in the canonical bundle K. This is a symmetric determinantal variety whose tangent spaces are described by a symmetrised Petri map. We show for many values of g, n and k that S(k, 2n, K) is nonempty and has a component which is generically smooth and of the expected dimension. As an application, we show that for certain n and k, for any curve of large genus the usual Brill-Noether locus B(k, 2n, 2n(g-1)) has a component of excess dimension. This is joint work with Ali Bajravani (Tabriz/Berlin).

Thomas Peternell, Semipositive Tangent Bundles and Canonical Extensions
2023-09-07 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Thomas Peternell
University of Bayreuth

Given a projective complex manifold M with an ample polarization there is canonically associated an affine bundle Z over M. The question I will discuss is under which circumstances Z is an affine variety, or at least Stein. This is related to the global structure of M, specifically to the semipositivity of the tangent bundle. I will explain the main conjectures and recent results (joint work with A. Höring).

Yum-Tong Siu, [IBS-KAIST Seminar] Differential Relations for Multiplier Ideal Sheaves in ∂ Estimates
2023-09-07 15:00 - 16:00 | B236-1, IBS, Korea, Republic of
Speaker

Yum-Tong Siu
Harvard University

For sums of squares of real vector fields, Hörmander linked subelliptic estimates to the spanning property of iterated Lie brackets of vector fields. Kohn studied the more complicated analogue of subelliptic ​∂​​​​ estimates for weakly pseudoconvex domains, with vector-valued unknowns.
In the weak-solution approach to solving the ∂​​​ equation, multipliers for the test function are introduced so that estimates hold after multiplication by a multiplier. Kohn used the dual formulation of differential forms instead of vector fields so that (i) the Lie brackets of vector fields are replaced by differential relations to generate new multipliers and (ii) the spanning property of iterated Lie brackets is replaced by the constant function 1 being a multiplier.
We will focus on recent problems and results concerning Kohn’s theory of subelliptic estimates in terms of D’Angelo’s condition of finite type. The distant eventual goal is to explore the theory for differential relations to generate multipliers for subelliptic estimates for a general system of equations with compatibility conditions.

Fabrizio Catanese, [IBS-KAIST Seminar] Geometry and Dynamics of Geometric Endomorphisms of the Hesse Moduli Space of Elliptic Curves
2023-09-08 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Fabrizio Catanese
University of Bayreuth

We consider the geometric map C, called Cayleyan, associating to a plane cubic E the adjoint of its dual curve. We show that C and the classical Hessian map H generate a free semigroup. We begin the investigation of the geometry and dynamics of these maps, and of the geometrically special elliptic curves: these are the elliptic curves isomorphic to cubics in the Hesse pencil which are fixed by some endomorphism belonging to the semigroup generated by H, C. We point out how the dynamic behaviours of H and C differ drastically. Firstly, concerning the number of real periodic points: for H these are infinitely many, for C they are just 4. Secondly, the Julia set of H is the whole projective line, unlike what happens for all elements of the semigroup which are not iterates of H.

Seung uk Jang, Vieta Involutions on Tropical Markov Cubics
2023-09-19 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Seung uk Jang
Université de Rennes 1

We discuss the algebraic dynamics on Markov cubics generated by Vieta involutions, in the tropicalized setting, including some introduction to the tropicalization. It turns out that there is an invariant subset of the tropicalized Markov cubic where the action by Vieta involutions can be modeled by that of the Farey reflection group on the hyperbolic plane.
Some applications in non-archimedean dynamics, number theory, or complex dynamical questions will also be introduced.

Yaoxiong Wen, Generalized Quiver Mutation and PAX/PAXY Models
2023-09-21 15:00 - 16:00 | B236-1, IBS, Korea, Republic of
Speaker

Yaoxiong Wen
KIAS

During this presentation, I will discuss the generalized quiver mutation conjecture proposed by Prof. Ruan. Our focus will be on proving this conjecture for the Grassmannian bundle. Additionally, we will explore the determinantal variety and its two different desingularizations, known as PAX/PAXY models. We will demonstrate the relationship between these models through generalized quiver mutation and prove the PAX/PAXY correspondence in the level of quasimap I-functions. This talk is based on the ongoing research collaboration with Mark Shoemaker and Nathan Priddis.

Guolei Zhong, Positivity of Tangent Sheaf of Projective Varieties
2023-10-10 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Guolei Zhong
IBS-CCG

In this talk, we discuss the structure of projective varieties with certain positive tangent sheaves. More precisely, when the tangent sheaf is almost nef or positively curved, we construct a well-defined MRC fibration and study the Fujita decomposition of reflexive sheaves. Besides, we show that the almost nefness of the tangent sheaf will impose rather restrictive condition on the singularities, and some typical examples will be given. This is based on my recent joint work with Masataka Iwai and Shin-ichi Matsumura.

Gil Bor, Cusps of Caustics by Reflection in a Convex Billiard Table
2023-10-16 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Gil Bor
CIMAT

Place a point light source inside a smooth convex billiard table (or mirror). The n-th caustic by reflection is the envelope of light rays after n reflections. Theorem: each of these caustics, for a generic point light source, has at least 4 cusps. Conjecture: there are exactly 4 cusps iff the table is an ellipse. Here are the 2nd, 5th and 8th caustics by reflection in an ellipse, each with 4 cusps (marked by gray disks; the light source is the white disk)

This is a billiard version of “Jacobi’s Last Geometric Statement”, concerning the number of cusps of the conjugate locus of a point on a convex surface, proved so far only in the n=1 case. (Joint work with Serge Tabachnikov, from Penn State, USA).

Gil Bor, Bicycle Tracks, their Monodromy Invariants and Geodesics
2023-10-16 16:00 - 17:00 | B236-1, IBS, Korea, Republic of
Speaker

Gil Bor
CIMAT

At first sight, the pair of front and back wheel tracks left by a passing bike on a sandy or muddy terrain seems like a random pair of curves. This is not the case. For example, one can usually distinguish between the front and back wheel tracks, and even the direction at which these were traversed, based solely on their shapes. You can try it for the following pair of paths.

Another example: If the front wheel traverses a small enough closed path (compared to the bike size), then, typically, the back track does not close up, by an amount approximated by the area enclosed by the front track and the bicycle length; this fact was utilized to build a simple area measuring mechanical device, now obsolete, called the Hatchet planimeter.
In recent years the subject has attracted attention due to newly discovered relations with the theory of completely integrable systems (the filament flow), sub-Riemannian geometry and elasticity theory. I will try to describe some of these developments and open questions.

Workshop on Parabolic Geometry and Related Topics
2023-10-17 - 2023-10-20 | B109, IBS, Korea, Republic of
Speakers
Gil Bor (CIMAT)
Andreas Cap (U. Vienna)
Sean Curry (Oklahoma State U.)
Mike Eastwood (U. Adelaide)
Jaehyun Hong (IBS-CCG)
Jun-Muk Hwang (IBS-CCG)
Sung Yeon Kim (IBS-CCG)
Ilya Kossovskiy (Masaryk U.)
Boris Kruglikov (U. Tromso)
Omid Makhmali (PAS-CTP)
Benjamin McMillan (IBS-CCG)
Tohru Morimoto (Nara Women’s U.)
Igor Zelenko (Texas A&M)
Abstracts
PDF file
Schedule
Oct. 17
10:00-11:00 Igor Zelenko
11:30-12:30 Ilya Kossovskiy
15:00-16:00 Gil Bor
16:30-17:30 Sung Yeon Kim
Oct. 18
10:00-11:00 Andreas Cap
11:30-12:30 Jun-Muk Hwang
14:30-15:30 Benjamin McMillan
Oct. 19
10:00-11:00 Sean Curry
11:30-12:30 Omid Makhmali
15:00-16:00 Tohru Morimoto
16:30-17:30 Jaehyun Hong
Oct. 20
10:00-11:00 Boris Kruglikov
11:30-12:30 Mike Eastwood
Organizer
Jun-Muk Hwang (IBS-CCG)
Venue
B109, IBS, Daejeon, Korea
More Information
• How to get to IBS-CCG

Yotsutani Naoto, Chow Stability and Non-symmetric Kähler-Einstein Toric Fano Manifolds
2023-10-25 11:00 - 12:00 | B266, IBS, Korea, Republic of
Speaker

Yotsutani Naoto
Kagawa University

In 2001, Donaldson proved that if a polarized manifold (X, L) admits constant scalar curvature Kähler metrics in c1(L), then (X, L) is asymptotically Chow stable whenever its automorphism group Aut(X, L) is discrete.
In this talk, we show that this result does not hold in the case where Aut(X, L) is not discrete.
This talk is based on a joint work with H. Ono and Y. Sano.

Seungjae Lee, Cohomological Isomorphism of Symmetric Power of Cotangent Bundle of Ball Quotient and its Toroidal Compactification
2023-11-01 15:00 - 16:00 | B236-1, IBS, Korea, Republic of
Speaker

Seungjae Lee
IBS CCG

In this talk, we investigate the L2-Dolbeault cohomology of the symmetric power of cotangent bundles of ball quotients with finite volume, as well as their toroidal compactification. As a result, we establish a version of L2-Hodge decompostion for complex hyperbolic space forms with finite volume, under some mild condition for lattice.

Andreas Höring, Projective Manifolds with Pseudoeffective (Co)tangent Bundle, I, II
2023-11-20 15:00 - 17:30 | B236-1, IBS, Korea, Republic of
Speaker

Andreas Höring
University of Nice

Symmetric holomorphic forms on projective manifolds have been studied from various angles in the last ten years : Brotbek-Darondeau and independently Song-Yan Xie have shown that complete intersections of sufficiently high degree and codimension have an ample cotangent bundle, so many symmetric forms. Vice versa Campana and Paun show that if the cotangent bundle is big, then X is of general type. In this series of lectures I will work under the assumption that the cotangent bundle is pseudoeffective. In general this positivity assumption is too weak to have any useful implications, but we will see that for the (co)tangent bundle it leads to surprisingly many restrictions on the geometry of the manifold. In particular we expect a nonvanishing property that is analogous to the famous nonvanishing conjecture for the canonical bundle. These talks are based on joint papers with Thomas Peternell and Junyan Cao.

Andreas Höring, Projective Manifolds with Pseudoeffective (Co)tangent Bundle, III, IV
2023-11-22 15:00 - 17:30 | B236-1, IBS, Korea, Republic of

Grzegorz Kapustka, Projective Models of Nikulin Orbifolds
2023-12-11 16:00 - 17:00 | B236-1, IBS, Korea, Republic of
Speaker

Grzegorz Kapustka
Jagiellonian University

We describe a locally complete family of projective irreducible holomorphic symplectic orbifolds as double covers of special complete intersections (3, 4) in P6. This is a joint work with C. Camere, A. Garbagnati and M. Kapustka.

Workshop on Classical Algebraic Geometry
2023-12-12 - 2023-12-15 | IBS Science Culture Center, Daejeon, Korea, Republic of
Speakers
Alberto Calabri (University of Ferrara)
Cinzia Casagrande (University of Torino)
Flaminio Flamini (University of Rome Tor Vergata)
Paola Frediani (University of Pavia)
Kangjin Han (DGIST)
Zhi Jiang (SCMS, Fudan University)
Akihiro Kanemitsu (Saitama University)
Grzegorz Kapustka (Jagiellonian University)
Michał Kapustka (IM PAN)
Seonja Kim (Chungwoon University)
Hirokazu Nasu (Tokai University)
Wenbo Niu (University of Arkansas)
Jinhyung Park (KAIST)
Xavier Roulleau (University of Angers)
Francesco Russo (University of Catania)
Eduardo Luis Solá Conde (University of Trento)
Abstracts
PDF file
Schedule
December 12 (Tuesday)

09:30~10:00
Registration

10:00~11:00
Cinzia Casagrande

11:00~11:30
Coffee Break

11:30~12:30
Jinhyung Park

12:30~14:30
Lunch

14:30~15:30
Seonja Kim

15:30~16:00
Coffee Break

16:00~17:00
Eduardo Luis Solá Conde

18:00~20:00
Dinner for Speakers

December 13 (Wednesday)

10:00~11:00
Flaminio Flamini

11:00~11:30
Coffee Break

11:30~12:30
Hirokazu Nasu

12:30~14:30
Lunch

14:30~15:30
Zhi Jiang

15:30~16:00
Coffee Break

16:00~17:00
Akihiro Kanemitsu

December 14 (Thursday)

10:00~11:00
Michał Kapustka

11:00~11:30
Coffee Break

11:30~12:30
Grzegorz Kapustka

12:30~14:30
Lunch

14:30~15:30
Alberto Calabri

15:30~16:00
Coffee Break

16:00~17:00
Francesco Russo

17:30~20:00
Banquet

December 15 (Friday)

10:00~11:00
Xavier Roulleau

11:00~11:30
Coffee Break

11:30~12:30
Wenbo Niu

12:30~14:00
Lunch

14:00~15:00
Kangjin Han

15:00~15:30
Coffee Break

15:30~16:30
Paola Frediani

Organizers
DongSeon Hwang (IBS-CCG)
Jun-Muk Hwang (IBS-CCG)
Yongnam Lee (IBS-CCG/KAIST)
Venue
IBS Science Culture Center
Registration
Please submit Google form by November 10th.
Main Hotel
Lotte City Hotel Daejeon (4-30 Doryong-dong, Yuseong-gu, Daejeon)
More Information
• How to get to IBS-CCG
• From Hotel to IBS

Workshop on Torus Actions in Symplectic and Algebraic Geometry
2024-01-15 - 2024-01-19 | IBS Science Culture Center, Daejeon, Korea, Republic of
Lecture Series
Kiumars Kaveh (University of Pittsburgh)
Hendrik Süß (University of Jena)*
Susan Tolman (University of Illinois at Urbana-Champaign)
Research Talks
Lara Bossinger (UNAM)
Isabelle Charton (University of Haifa)
Oliver Clarke (University of Edinburgh)
Peter Crooks (Utah State University)
Naoki Fujita (Kumamoto University)
Yoosik Kim (Pusan National University)
Donggun Lee (IBS CCG)
Joseph Palmer (University of Illinois at Urbana-Champaign)
Andrea Petracci (Università di Bologna)
Milena Wrobel (University of Oldenburg)
* = online
Abstracts
Website
Schedule

Monday
Tuesday
Wednesday
Thursday
Friday

9:40 – 10:40

Kaveh 2
Kaveh 4
Bossinger
Kim

11:10 – 12:10

Tolman 2
Tolman 3
Clarke
Charton

12:20 – 14:00

Lunch
Lunch
Lunch
Lunch

14:00 -15:00
Kaveh 1
Kaveh 3
Fujita
Petracci
Palmer

15:30 – 16:30
Tolman 1
5-minute talks
Lee
Wrobel
Crooks

17:00 – 18:00
Süß 1
Süß 2
Süß 3
Süß 4

Banquet

Organizers
Yunhyung Cho (Sungkyunkwan University)
Jaehyun Hong (IBS CCG)
Donghoon Jang (Pusan National University)
Eunjeong Lee (Chungbuk National University)
Venue
IBS Science Culture Center
Registration
Please submit Google form by December 17.
Poster
PDF file
More Information
• How to get to IBS-CCG
• Accommodations
• Restaurants

Youngju Kim, Tubular Neighborhoods in Complex Hyperbolic Manifolds
2024-02-07 16:00 - 17:00 | B236-1, IBS, Korea, Republic of
Speaker

Youngju Kim
Konkuk University

The collar lemma says that a closed geodesic in a real hyperbolic 2-manifold has an embedded tubular neighborhood whose width only depends on the length of the geodesic. The width of the collar does not depend on the underlying hyperbolic 2-manifold. On the other hand, a totally geodesic surface with codimension bigger than 1 in a hyperbolic manifold of can be arbitrary closed to itself. Here, we prove that an embedded complex totally geodesic surface in a complex hyperbolic 2-manifold has a tubular neighborhood whose size depends only on its area. This is a joint work with A. Basmajian.

Caucher Birkar, Stable Minimal Models
2024-02-20 17:00 - 18:00 | on-line
Zoom ID: 880 6763 5837
PW: [REDACTED]

Speaker

Caucher Birkar
Tsinghua University

In this talk I will introduce stable minimal models and discuss some related results and if times allows, problems.
(This seminar is a part of School and Workshop on Moduli, K-trivial Varieties, and Related Topics)

School and Workshop on Moduli, K-trivial Varieties, and Related Topics
2024-02-21 - 2024-02-29 | IBS Science Culture Center Daejeon, Korea, Republic of (On Feb 23, the venue will be in B109, IBS)
Speakers for Mini-courses (Feb 21~23)
Harold Blum (University of Utah)
Radu Laza (Stony Brook University)
Colleen Robles (Duke University)
Speakers for Workshop (Feb 21~23, and 26-29)
Kenneth Ascher (UC Irvine)
Philip Engel (Univ. of Bonn)
Laure Flapan (Michigan State University)
Yoon-Joo Kim (Columbia University)
Kyoung-Seog Lee (POSTECH)
Zhiyuan Li (SCMS, Fudan University)
Yuchen Liu (Northwestern University)
Eyal Markman (University of Massachusetts)
Mirko Mauri (École Polytechnique)
Enrica Mazzon (University of Regensburg)
Yuji Odaka (Kyoto University)
Kieran O’Grady (University of Rome, La Sapienza)
Keiji Oguiso (University of Tokyo)
Gianluca Pacienza (University of Lorraine)
Colleen Robles (Duke University)
Justin Sawon (University of North Carolina)
Qizheng Yin (BICMR, Peking University)
Abstracts
• School
• Workshop
Schedule (School and Workshop)
* Additional talk (online) by Caucher Birkar (Tsinghua U.) at 17:00-18:00 in February 20 (Tue)
(Zoom ID and PW can be found here.)
February 21 (Wednesday)

09:30~10:00
Registration

10:00~11:00
Radu Laza, Lect I

11:00~11:30
Coffee Break

11:30~12:30
Colleen Robles, Lect I

12:30~14:30
Lunch

14:30~15:30
Harold Blum, Lect I

15:30~16:00
Coffee Break

16:00~17:00
Keiji Oguiso

17:30~19:30
Dinner (for speakers)

February 22 (Thursday)

10:00~11:00
Radu Laza, Lect II

11:00~11:30
Coffee Break

11:30~12:30
Colleen Robles, Lect II

12:30~14:30
Lunch

14:30~15:30
Harold Blum, Lect II

15:30~16:00
Coffee Break

16:00~17:00
Yuji Odaka

17:30~19:30
Banquet

February 23 (Friday)

10:00~11:00
Radu Laza, Lect III

11:00~11:30
Coffee Break

11:30~12:30
Colleen Robles, Lect III

12:30~14:30
Lunch

14:30~15:30
Harold Blum, Lect III

15:30~16:00
Coffee Break

16:00~17:00
Kyeong-Seog Lee

18:00~20:00
Dinner (for speakers)

February 26 (Monday)

9:30~10:00
Registration

10:00~11:00
Kieran O’Grady

11:00~11:30
Coffee Break

11:30~12:30
Philip Engel

12:30~14:30
Lunch

14:30~15:30
Enrica Mazzon

15:30~16:00
Coffee Break

16:00~17:00
Yoon-Joo Kim

17:30~19:30
Dinner (for speakers)

February 27 (Tuesday)

10:00~11:00
Gianluca Pacienza

11:00~11:30
Coffee Break

11:30~12:30
Laure Flapan

12:30~14:30
Lunch

14:30~15:30
Kenneth Ascher

15:30~16:00
Coffee Break

16:00~17:00
Yuchen Liu

February 28 (Wednesday)

10:00~11:00
Justin Sawon

11:00~11:30
Coffee Break

11:30~12:30
Qizheng Yin

12:30~14:30
Lunch

14:30~15:30
Colleen Robles

15:30~16:00
Coffee Break

16:00~17:00
Mirko Mauri

17:30~19:30
Banquet

February 29 (Thursday)

10:00~11:00
Zhiyuan Li

11:00~11:30
Coffee Break

11:30~12:30
Eyal Markman

12:30~14:30
Lunch

Organizers
Jun-Muk Hwang (IBS-CCG)
Radu Laza (Stony Brook University)
Yongnam Lee (IBS-CCG/KAIST)
Main Hotel
Lotte City Hotel Daejeon (4-30 Doryong-dong, Yuseong-gu, Daejeon)
Venue
IBS Science Culture Center
Registration
Please submit Google form by February 7.
More Information
• How to get to IBS-CCG

Gebhard Martin, Automorphisms of del Pezzo Surfaces I
2024-03-05 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Gebhard Martin
Universität Bonn

Motivated by the classification of finite subgroups of the Cremona group of the plane, I will survey old and new results on automorphism groups of del Pezzo surfaces. In particular, I will report on joint work with Igor Dolgachev on the classification of automorphism groups of smooth del Pezzo surfaces and on joint work with Claudia Stadlmayr on the classification of vector fields on mildly singular del Pezzo surfaces. Special emphasis will be placed on the theory of actions of infinitesimal group schemes and characteristic-free methods in classical algebraic geometry.
