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X-WR-CALNAME:Center for Complex Geometry
X-ORIGINAL-URL:https://ccg.ibs.re.kr
X-WR-CALDESC:Events for Center for Complex Geometry
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BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20220101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230919T110000
DTEND;TZID=Asia/Seoul:20230919T120000
DTSTAMP:20260416T062454
CREATED:20230909T045536Z
LAST-MODIFIED:20230909T045536Z
UID:2522-1695121200-1695124800@ccg.ibs.re.kr
SUMMARY:Seung uk Jang\, Vieta Involutions on Tropical Markov Cubics
DESCRIPTION:    Speaker\n\n\nSeung uk Jang\nUniversité de Rennes 1\n\n\n\n\n\n\nWe 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. \nSome applications in non-archimedean dynamics\, number theory\, or complex dynamical questions will also be introduced.
URL:https://ccg.ibs.re.kr/event/2023-09-19/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230908T110000
DTEND;TZID=Asia/Seoul:20230908T120000
DTSTAMP:20260416T062454
CREATED:20230731T073447Z
LAST-MODIFIED:20230904T004225Z
UID:2414-1694170800-1694174400@ccg.ibs.re.kr
SUMMARY:Fabrizio Catanese\, [IBS-KAIST Seminar] Geometry and Dynamics of Geometric Endomorphisms of the Hesse Moduli Space of Elliptic Curves
DESCRIPTION:    Speaker\n\n\nFabrizio Catanese\nUniversity of Bayreuth\n\n\n\n\n\n\nWe 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.
URL:https://ccg.ibs.re.kr/event/2023-09-08/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230907T150000
DTEND;TZID=Asia/Seoul:20230907T160000
DTSTAMP:20260416T062454
CREATED:20230731T073302Z
LAST-MODIFIED:20230731T084230Z
UID:2410-1694098800-1694102400@ccg.ibs.re.kr
SUMMARY:Yum-Tong Siu\, [IBS-KAIST Seminar] Differential Relations for Multiplier Ideal Sheaves in ∂ Estimates
DESCRIPTION:    Speaker\n\n\nYum-Tong Siu\nHarvard University\n\n\n\n\n\n\nFor 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. \nIn 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. \nWe 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.
URL:https://ccg.ibs.re.kr/event/2023-09-07-1500-1600/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230907T110000
DTEND;TZID=Asia/Seoul:20230907T120000
DTSTAMP:20260416T062454
CREATED:20230731T072556Z
LAST-MODIFIED:20230802T012652Z
UID:2408-1694084400-1694088000@ccg.ibs.re.kr
SUMMARY:Thomas Peternell\, Semipositive Tangent Bundles and Canonical Extensions
DESCRIPTION:    Speaker\n\n\nThomas Peternell\nUniversity of Bayreuth\n\n\n\n\n\n\nGiven 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).
URL:https://ccg.ibs.re.kr/event/2023-09-07-1100-1200/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230906T110000
DTEND;TZID=Asia/Seoul:20230906T120000
DTSTAMP:20260416T062454
CREATED:20230731T072411Z
LAST-MODIFIED:20230731T072411Z
UID:2406-1693998000-1694001600@ccg.ibs.re.kr
SUMMARY:George Hitching\, Brill-Noether Loci on Moduli Space of Symplectic Bundles over a Curve
DESCRIPTION:    Speaker\n\n\nGeorge Hitching\nOslo Metropolitan University\n\n\n\n\n\n\nLet 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).
URL:https://ccg.ibs.re.kr/event/2023-09-06/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230905T160000
DTEND;TZID=Asia/Seoul:20230905T170000
DTSTAMP:20260416T062454
CREATED:20230904T004640Z
LAST-MODIFIED:20230904T004709Z
UID:2498-1693929600-1693933200@ccg.ibs.re.kr
SUMMARY:Takayuki Koike\, On Some Variants of Ueda's Lemma and its Application
DESCRIPTION:    Speaker\n\n\nTakayuki Koike\n(Osaka Metropolitan University)\n\n\n\n\n\n\nIn 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.
URL:https://ccg.ibs.re.kr/event/2023-09-05/
LOCATION:on-line
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230816
DTEND;VALUE=DATE:20230819
DTSTAMP:20260416T062454
CREATED:20230504T070002Z
LAST-MODIFIED:20230731T055006Z
UID:2280-1692144000-1692403199@ccg.ibs.re.kr
SUMMARY:KSCV Workshop #26
DESCRIPTION:Speakers\nTaeyong Ahn (Inha University)\nYe-Won Luke Cho (Pusan National University)\nYoung-Jun Choi (Pusan National University)\nPham Hoang Hiep (Vietnam Academy of Science and Technology)\nDinh Tuan Huynh (Hue University of Education-Hue University)\nŁukasz Kosiński (Jagiellonian University)\nKang-Hyurk Lee (Gyeongsang National University)\nMan-Chun Lee (The Chinese University of Hong Kong)\nHoseob Seo (Institute for Basic Science)\nGuolei Zhong (Institute for Basic Science) \nAbstracts\nPDF File \nSchedule\nDay 1: August 16 (Wednesday) \n\n\n\n~10:00\nRegistration\n\n\n10:00~11:00\nKang-Hyurk Lee\nThe method of potential rescaling and a characterization of the unit ball\n\n\n11:00~11:30\nCoffee Break\n\n\n11:30~12:30\nDinh Tuan Huynh (online)\nUniversal entrie curves in projective spaces with slow growth\n\n\n12:30~14:30\nLunch\n\n\n14:30~15:30\nTaeyong Ahn\nEquidistribution of positive closed currents on a compact Kähler manifold\n\n\n15:30~16:00\nCoffee Break\n\n\n16:00-17:00\nGuolei Zhong\nCompact Kähler threefolds with the action of an abelian group of maximal dynamical rank\n\n\n18:00~20:00\nSpeakers Dinner\n\n\n\n  \nDay 2: August 17 (Thursday) \n\n\n\n10:00~11:00\nYoung-Jun Choi\nAn injectivity theorem on snc compact Kähler spaces\n\n\n11:00~11:30\nCoffee Break\n\n\n11:30~12:30\nPham Hoang Hiep (online)\nSingularity invariants of plurisubharmonic functions\n\n\n12:30~14:30\nLunch\n\n\n14:30~15:30\nMan-Chun Lee\nKähler-Ricci flow on non-compact manifolds and application\n\n\n15:30~16:00\nCoffee Break\n\n\n16:00-17:00\nYe-Won Luke Cho\nContinuity of singular Kähler-Einstein potentials\n\n\n17:30-19:00\nBanquet\n\n\n\n  \nDay 3: August 19 (Friday) \n\n\n\n10:00~11:00\nHoseob-Seo\nOhsawa measures on singular hypersurfaces and its applications\n\n\n11:00~11:30\nCoffee Break\n\n\n11:30~12:30\nŁukasz Kosiński\nA Gehring-Hayman inequality\n\n\n\nOrganizers\nDano Kim (Seoul National University)\nSung-Yeon Kim (Institute for Basic Science)\nN. Cuong Nguyen (Korea Advanced Institute of Science and Technology)\nAeryeong Seo (Kyungpook National University) \nVenue\nB109\, IBS\, Korea \nRegistration\nPlease submit Google form by July 28. \nMore Information\n• How to get to IBS-CCG\n• From Hotel to IBS\n• IBS Cafeteria (Lunch) \nParticipants\nSui-Chung Ng (East China Normal University)\nBou Kang (KAIST)\nMario Chan (Pusan National University)\nJisoo Byun (Kyungnam University)\nHoseob Seo (Institute for Basic Science)\nSungmin Yoo (Incheon National University)\nSeungjae Lee (Institute for Basic Science)\nHan-Wool Lee (Korea University)\nHanjin Lee (Handong Global University)\nJiwon Jeong (Pusan National University)\nYe-Won Luke Cho (Pusan National University)\nBoo Rim Choe (Korea University)\nHyunil Choi (Pusan National University)\nJihun Yum (Institute for Basic Science)\nKang-Hyurk Lee (Gyeongsang National University)\nDo young Choi (KAIST)\nKang-Tae Kim (POSTECH)\nChiwon Yoon (KAIST) \nSupported by Institute for Mathematical Convergence\, KNU
URL:https://ccg.ibs.re.kr/event/2023-08-16-18/
LOCATION:B109\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230808T150000
DTEND;TZID=Asia/Seoul:20230808T163000
DTSTAMP:20260416T062454
CREATED:20230720T004618Z
LAST-MODIFIED:20230720T004618Z
UID:2377-1691506800-1691512200@ccg.ibs.re.kr
SUMMARY:Kyeong-Dong Park\, K-stability of Fano Spherical Varieties\, III
DESCRIPTION:    Speaker\n\n\nKyeong-Dong Park\nGyeongsang National University\n\n\n\n\n\n\nThe 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. \n(1) Spherical varieties\, colored fans\, and algebraic moment polytopes \n(2) Criterion for K-stability of Fano spherical varieties and its applications \n(3) Equivariant test configurations with horospherical central fiber\, and modified Futaki invariant
URL:https://ccg.ibs.re.kr/event/2023-08-08-1500-1630/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230808T103000
DTEND;TZID=Asia/Seoul:20230808T120000
DTSTAMP:20260416T062454
CREATED:20230720T004506Z
LAST-MODIFIED:20230720T004633Z
UID:2375-1691490600-1691496000@ccg.ibs.re.kr
SUMMARY:Kyeong-Dong Park\, K-stability of Fano Spherical Varieties\, II
DESCRIPTION:    Speaker\n\n\nKyeong-Dong Park\nGyeongsang National University\n\n\n\n\n\n\nThe 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. \n(1) Spherical varieties\, colored fans\, and algebraic moment polytopes \n(2) Criterion for K-stability of Fano spherical varieties and its applications \n(3) Equivariant test configurations with horospherical central fiber\, and modified Futaki invariant
URL:https://ccg.ibs.re.kr/event/2023-08-08-1030-1200/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230807T150000
DTEND;TZID=Asia/Seoul:20230807T163000
DTSTAMP:20260416T062454
CREATED:20230720T004336Z
LAST-MODIFIED:20230802T043609Z
UID:2372-1691420400-1691425800@ccg.ibs.re.kr
SUMMARY:Kyeong-Dong Park\, K-stability of Fano Spherical Varieties\, I
DESCRIPTION:    Speaker\n\n\nKyeong-Dong Park\nGyeongsang National University\n\n\n\n\n\n\nThe 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. \n(1) Spherical varieties\, colored fans\, and algebraic moment polytopes \n(2) Criterion for K-stability of Fano spherical varieties and its applications \n(3) Equivariant test configurations with horospherical central fiber\, and modified Futaki invariant
URL:https://ccg.ibs.re.kr/event/2023-08-07-1500-1630/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230807T140000
DTEND;TZID=Asia/Seoul:20230807T145000
DTSTAMP:20260416T062454
CREATED:20230802T061117Z
LAST-MODIFIED:20230802T061320Z
UID:2425-1691416800-1691419800@ccg.ibs.re.kr
SUMMARY:Minseong Kwon\, Spherical Geometry of Hilbert Schemes of Conics in Adjoint Varieties
DESCRIPTION:    Speaker\n\n\nMinseong Kwon\nKAIST\n\n\n\n\n\n\nFor 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.
URL:https://ccg.ibs.re.kr/event/2023-08-07-1400-1450/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230803T160000
DTEND;TZID=Asia/Seoul:20230803T170000
DTSTAMP:20260416T062454
CREATED:20230724T090504Z
LAST-MODIFIED:20230724T090504Z
UID:2389-1691078400-1691082000@ccg.ibs.re.kr
SUMMARY:Gunhee Cho\, Non-measure Hyperbolicity of K3 and Enriques Surfaces
DESCRIPTION:    Speaker\n\n\nGunhee Cho\nUCSB\n\n\n\n\n\n\nBy 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.
URL:https://ccg.ibs.re.kr/event/2023-08-03/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230726T100000
DTEND;TZID=Asia/Seoul:20230726T121500
DTSTAMP:20260416T062454
CREATED:20230615T085501Z
LAST-MODIFIED:20230615T085501Z
UID:2321-1690365600-1690373700@ccg.ibs.re.kr
SUMMARY:Chang-Yeon Chough\, Introduction to algebraic stacks\, VII\, VIII
DESCRIPTION:    Speaker\n\n\nChang-Yeon Chough\nSogang Univ.\n\n\n\n\n\n\nThis 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.
URL:https://ccg.ibs.re.kr/event/2023-07-26/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230725T150000
DTEND;TZID=Asia/Seoul:20230725T173000
DTSTAMP:20260416T062454
CREATED:20230615T085406Z
LAST-MODIFIED:20230712T131050Z
UID:2319-1690297200-1690306200@ccg.ibs.re.kr
SUMMARY:Chang-Yeon Chough\, Introduction to algebraic stacks\, V\, VI
DESCRIPTION:    Speaker\n\n\nChang-Yeon Chough\nSogang Univ.\n\n\n\n\n\n\nThis 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.
URL:https://ccg.ibs.re.kr/event/2023-07-25-1500-1730/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230725T110000
DTEND;TZID=Asia/Seoul:20230725T120000
DTSTAMP:20260416T062454
CREATED:20230712T131020Z
LAST-MODIFIED:20230716T052748Z
UID:2356-1690282800-1690286400@ccg.ibs.re.kr
SUMMARY:Patrick Brosnan\, How Markman Saves the Hodge Conjecture (for Weil Type Abelian Fourfolds) from Kontsevich\, II
DESCRIPTION:    Speaker\n\n\nPatrick Brosnan\nUniversity of Maryland\n\n\n\n\n\n\nI’ll explain what I know about two very interesting pieces of work: \n(1) Markman’s proof of the Hodge conjecture for Weil type abelian fourfolds of discriminant 1. \n(2) Kontsevich’s tropical approach to looking for counterexamples to the Hodge conjecture for Weil type abelian varieties. \nThen I’ll explain a simple observation of mine\, which implies that Kontsevich’s approach cannot work for abelian fourfolds of any discriminant. \nI’ll start out by explaining the statement of (1) precisely along with the geometric input that is required in (2). Then I’ll formulate my observation\, which is really about why the discriminant determines what types of degenerations an abelian fourfold of Weil type can have. Along the way\, I’ll take the opportunity to say a little bit about Markman’s proof of (1).
URL:https://ccg.ibs.re.kr/event/2023-07-25-1100-1200/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230720T110000
DTEND;TZID=Asia/Seoul:20230720T120000
DTSTAMP:20260416T062454
CREATED:20230712T130908Z
LAST-MODIFIED:20230716T052735Z
UID:2354-1689850800-1689854400@ccg.ibs.re.kr
SUMMARY:Patrick Brosnan\, How Markman Saves the Hodge Conjecture (for Weil Type Abelian Fourfolds) from Kontsevich\, I
DESCRIPTION:    Speaker\n\n\nPatrick Brosnan\nUniversity of Maryland\n\n\n\n\n\n\nI’ll explain what I know about two very interesting pieces of work: \n(1) Markman’s proof of the Hodge conjecture for Weil type abelian fourfolds of discriminant 1. \n(2) Kontsevich’s tropical approach to looking for counterexamples to the Hodge conjecture for Weil type abelian varieties. \nThen I’ll explain a simple observation of mine\, which implies that Kontsevich’s approach cannot work for abelian fourfolds of any discriminant. \nI’ll start out by explaining the statement of (1) precisely along with the geometric input that is required in (2). Then I’ll formulate my observation\, which is really about why the discriminant determines what types of degenerations an abelian fourfold of Weil type can have. Along the way\, I’ll take the opportunity to say a little bit about Markman’s proof of (1).
URL:https://ccg.ibs.re.kr/event/2023-07-20/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230719T100000
DTEND;TZID=Asia/Seoul:20230719T121500
DTSTAMP:20260416T062454
CREATED:20230615T085304Z
LAST-MODIFIED:20230615T085519Z
UID:2317-1689760800-1689768900@ccg.ibs.re.kr
SUMMARY:Chang-Yeon Chough\, Introduction to algebraic stacks\, III\, IV
DESCRIPTION:    Speaker\n\n\nChang-Yeon Chough\nSogang Univ.\n\n\n\n\n\n\nThis 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.
URL:https://ccg.ibs.re.kr/event/2023-07-19/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230718T150000
DTEND;TZID=Asia/Seoul:20230718T173000
DTSTAMP:20260416T062454
CREATED:20230615T085143Z
LAST-MODIFIED:20230615T085546Z
UID:2315-1689692400-1689701400@ccg.ibs.re.kr
SUMMARY:Chang-Yeon Chough\, Introduction to algebraic stacks\, I\, II
DESCRIPTION:    Speaker\n\n\nChang-Yeon Chough\nSogang Univ.\n\n\n\n\n\n\nThis 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.
URL:https://ccg.ibs.re.kr/event/2023-07-18/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230711T160000
DTEND;TZID=Asia/Seoul:20230711T170000
DTSTAMP:20260416T062454
CREATED:20230621T041523Z
LAST-MODIFIED:20230621T041523Z
UID:2343-1689091200-1689094800@ccg.ibs.re.kr
SUMMARY:Qifeng Li\, Rigidity of Projective Symmetric Manifolds of Picard Number 1 Associated to Composition Algebras
DESCRIPTION:    Speaker\n\n\nQifeng Li\nShandong University\n\n\n\n\n\n\nTo each complex composition algebra A\, there associates a projective symmetric manifold X(A) of Picard number 1. The vareity X(A) is closed related with Freudenthal’s Magic Square\, which is a square starting from the adjiont varieties of F4\, E6\, E7 and E8. In a recent joint work with Yifei Chen and Baohua Fu\, we obtain the deformation rigidity of X(A). In this talk\, we will introduce the construction of X(A) from Freudenthal’s Magic Square\, the geometric properties of them\, and finally the deformation rigidity of X(A).
URL:https://ccg.ibs.re.kr/event/2023-07-11/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230706T110000
DTEND;TZID=Asia/Seoul:20230706T120000
DTSTAMP:20260416T062454
CREATED:20230620T054046Z
LAST-MODIFIED:20230620T054046Z
UID:2340-1688641200-1688644800@ccg.ibs.re.kr
SUMMARY:Shinnosuke Okawa\, Semiorthogonal Decompositions and Relative Canonical Base Locus
DESCRIPTION:    Speaker\n\n\nShinnosuke Okawa\nOsaka University\n\n\n\n\n\n\nMotivated by the DK hypothesis\, some years ago I proved that SODs of the derived category of a smooth projective variety are strongly constrained by the base locus of the canonical linear system. In particular\, this leads to the indecomposability of the derived category of varieties whose canonical bundles are globally generated (hence minimal). In this talk I will briefly recall this work and discuss its generalization to the relative settings. The latter implies new indecomposability results\, including the case of minimal surfaces of positive irregularity. This talk is based on arXiv:2304.14048.
URL:https://ccg.ibs.re.kr/event/2023-07-06/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230704T160000
DTEND;TZID=Asia/Seoul:20230704T170000
DTSTAMP:20260416T062454
CREATED:20230620T053922Z
LAST-MODIFIED:20230620T053922Z
UID:2338-1688486400-1688490000@ccg.ibs.re.kr
SUMMARY:Shinnosuke Okawa\, Moduli Space of Semiorthogonal Decompositions
DESCRIPTION:    Speaker\n\n\nShinnosuke Okawa\nOsaka University\n\n\n\n\n\n\nSemiorthogonal decomposition (SOD) is a central notion in the study of triangulated categories. In particular\, SODs of the bounded derived category of coherent sheaves of a variety (SODs of the variety\, for short) have profound relations to its geometry. In this talk I discuss the moduli functor which classifies SODs of the fibers of smooth projective morphisms. The main result is that it is an algebraic space which is locally etale over the target of the morphism. I will explain the main points of the proof\, various applications and open problems. This talk is based on the joint work arXiv:2002.03303 with Andrea Ricolfi and Pieter Belmans.
URL:https://ccg.ibs.re.kr/event/2023-07-04/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230622T110000
DTEND;TZID=Asia/Seoul:20230622T120000
DTSTAMP:20260416T062454
CREATED:20230310T045150Z
LAST-MODIFIED:20230601T124014Z
UID:2130-1687431600-1687435200@ccg.ibs.re.kr
SUMMARY:Shin-Young Kim\, Minimal Rational Curves on Complete Symmetric Varieties
DESCRIPTION:    Speaker\n\n\nShin-Young Kim\nIBS-CGP\n\n\n\n\n\n\nWe describe the families of minimal rational curves on any complete symmetric variety\, and the corresponding varieties of minimal rational tangents. In particular\, we prove that these varieties are homogeneous and that for non-exceptional irreducible wonderful varieties\, there is a unique family of minimal rational curves. We relate these results to the restricted root system of the associated symmetric space. In particular\, for certain Fano wonderful symmetric varieties\, the VMRT has two connected components. This is a joint work with M.Brion and N. Perrin.
URL:https://ccg.ibs.re.kr/event/2023-06-22/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230620T110000
DTEND;TZID=Asia/Seoul:20230620T120000
DTSTAMP:20260416T062454
CREATED:20230421T053444Z
LAST-MODIFIED:20230421T053619Z
UID:2251-1687258800-1687262400@ccg.ibs.re.kr
SUMMARY:Sung Gi Park\, Kodaira Dimension and Hyperbolicity for Smooth Families of Varieties
DESCRIPTION:    Speaker\n\n\nSung Gi Park\nHarvard University\n\n\n\n\n\n\nIn this talk\, I will discuss the behavior of positivity\, hyperbolicity\, and Kodaira dimension under smooth morphisms of complex quasi-projective manifolds. This includes a vast generalization of a classical result: a fibration from a projective surface of non-negative Kodaira dimension to a projective line has at least three singular fibers. Furthermore\, I will explain a proof of Popa’s conjecture on the superadditivity of the log Kodaira dimension over bases of dimension at most three. These theorems are applications of the main technical result\, namely the logarithmic base change theorem.
URL:https://ccg.ibs.re.kr/event/2023-06-20/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230616T153000
DTEND;TZID=Asia/Seoul:20230616T170000
DTSTAMP:20260416T062454
CREATED:20230510T091234Z
LAST-MODIFIED:20230510T091234Z
UID:2291-1686929400-1686934800@ccg.ibs.re.kr
SUMMARY:Minseong Kwon\, Introduction to Grauert Tubes
DESCRIPTION:    Speaker\n\n\nMinseong Kwon\nKAIST\n\n\n\n\n\n\nTBA
URL:https://ccg.ibs.re.kr/event/2023-06-16/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230614T153000
DTEND;TZID=Asia/Seoul:20230614T170000
DTSTAMP:20260416T062454
CREATED:20230510T091121Z
LAST-MODIFIED:20230510T091121Z
UID:2289-1686756600-1686762000@ccg.ibs.re.kr
SUMMARY:Paul-Andi Nagy\, Introduction to Feix-Kaledin Construction
DESCRIPTION:    Speaker\n\n\nPaul-Andi Nagy\nIBS-CCG\n\n\n\n\n\n\nTBA
URL:https://ccg.ibs.re.kr/event/2023-06-14/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230523T163000
DTEND;TZID=Asia/Seoul:20230523T173000
DTSTAMP:20260416T062454
CREATED:20230421T053301Z
LAST-MODIFIED:20230421T053301Z
UID:2249-1684859400-1684863000@ccg.ibs.re.kr
SUMMARY:Changho Han\, Compact Moduli of K3 Surfaces with a Given Nonsymplectic Cyclic Action
DESCRIPTION:    Speaker\n\n\nChangho Han\nUniversity of Waterloo\n\n\n\n\n\n\nTo construct a moduli space which is itself a compactification of a given moduli space\, one needs to enlarge the class of objects in consideration (e.g. adding certain singular curves to the class of smooth curves). After a brief review of the compactifications of the moduli of elliptic curves\, I will generalize into looking at various compactifications of the moduli of K3 surfaces with nonsymplectic cyclic actions\, and then discuss how those compactifications are birationally related to each other. As an application\, I will apply this framework into Kondo’s moduli space of sextic K3 surfaces with Z/3Z action. Results come from joint works (in progress) with Valery Alexeev\, Anand Deopurkar\, and Philip Engel.
URL:https://ccg.ibs.re.kr/event/2023-05-23/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230515
DTEND;VALUE=DATE:20230520
DTSTAMP:20260416T062454
CREATED:20230127T105521Z
LAST-MODIFIED:20230525T132424Z
UID:2036-1684108800-1684540799@ccg.ibs.re.kr
SUMMARY:Workshop on Moduli\, K-stability\, Fano varieties\, and related topics
DESCRIPTION:Speakers\nArnaud Beauville (University of Nice)\nFabrizio Catanese (University of Bayreuth)\nThibaut Delcroix (University of Montpellier)\nKento Fujita (Osaka University)\nYoung-Hoon Kiem (KIAS)\nShigeru Mukai (RIMS\, Kyoto University)\nYuri Prokhorov (Steklov Mathematical Institute)\nConstantin Shramov (Steklov Mathematical Institute) \nAbstracts\nPDF File \nSchedule\nDay 1: May 15 (Monday) \n  \n\n\n\n~10:00\nRegistration\n\n\n10:00~11:00\nShigeru Mukai\nModuli of curves of genus 11\, and prime Fano 3-folds of adjacent poristic genera\, I\n\n\n11:00~11:20\nCoffee Break\n\n\n11:20~12:20\nKento Fujita\nThe Calabi problem for Fano threefolds\, I\n\n\n12:20~15:00\nLunch\n\n\n15:00~16:00\nShigeru Mukai\nModuli of curves of genus 11\, and prime Fano 3-folds of adjacent poristic genera\, II\n\n\n16:00~16:30\nCoffee Break\n\n\n16:30-17:30\nKento Fujita\nThe Calabi problem for Fano threefolds\, II\n\n\n18:00~20:00\nDinner for Speakers\n\n\n\n  \nDay 2: May 16 (Tuesday) \n\n\n\n10:00~11:00\nYuri Prokhorov\nOn the classification of singular Fano threefolds\, I\n\n\n11:00~11:20\nCoffee Break\n\n\n11:20~12:20\nConstantin Shramov\nConic bundles\, I\n\n\n12:20~15:00\nLunch\n\n\n15:00~16:00\nYuri Prokhorov\nOn the classification of singular Fano threefolds\, II\n\n\n16:00~16:30\nCoffee Break\n\n\n16:30-17:30\nConstantin Shramov\nConic bundles\, II\n\n\n\n  \nDay 3: May 17 (Wednesday) \n\n\n\n10:00~11:00\nArnaud Beauville\nSymmetric tensors on the intersection of two quadrics and Lagrangian fibration\, I\n\n\n11:00~11:20\nCoffee Break\n\n\n11:20~12:20\nThibaut Delcroix\nEffective K-stability of spherical varieties\, I\n\n\n13:20~20:00\nExcursion\n\n\n\n  \nDay 4: May 18 (Thursday) \n\n\n\n10:00~11:00\nArnaud Beauville\nSymmetric tensors on the intersection of two quadrics and Lagrangian fibration\, II\n\n\n11:00~11:20\nCoffee Break\n\n\n11:20~12:20\nThibaut Delcroix\nEffective K-stability of spherical varieties\, II\n\n\n12:20~15:00\nLunch\n\n\n15:00~16:00\nYoung-Hoon Kiem\nCounting surfaces in projective varieties\, I\n\n\n16:00~16:30\nCoffee Break\n\n\n16:30-17:30\nFabrizio Catanese\nStatus of the classification and old and new constructions for surfaces of general type with pg=q=2\, I\n\n\n18:00~20:00\nBanquet\n\n\n\n  \nDay 5: May 19 (Friday) \n\n\n\n10:00~11:00\nYoung-Hoon Kiem\nCounting surfaces in projective varieties\, II\n\n\n11:00~11:20\nCoffee Break\n\n\n11:20~12:20\nFabrizio Catanese\nStatus of the classification and old and new constructions for surfaces of general type with pg=q=2\, II\n\n\n\nOrganizers\nYongnam Lee (IBS-CCG/KAIST)\nJihun Park (IBS-CGP/POSTECH) \nMain Hotel\nLotte City Hotel Daejeon (4-30 Doryong-dong\, Yuseong-gu\, Daejeon) \nRegistration\nPlease submit Google form by April 21. \nMore Information\n• How to get to IBS-CCG\n• From Hotel to IBS\n• IBS Cafeteria (Lunch)
URL:https://ccg.ibs.re.kr/event/2023-05-15-19/
LOCATION:IBS Science Culture Center\, Daejeon\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/jpeg:https://ccg.ibs.re.kr/wp-content/uploads/2023/01/Group-Photo3-1-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230511T110000
DTEND;TZID=Asia/Seoul:20230511T120000
DTSTAMP:20260416T062454
CREATED:20230426T033135Z
LAST-MODIFIED:20230426T033548Z
UID:2272-1683802800-1683806400@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Fano 3-folds\, Lagrangian Fibration and Leech-K3 Geometry III
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nPDF file
URL:https://ccg.ibs.re.kr/event/2023-05-11/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230509T150000
DTEND;TZID=Asia/Seoul:20230509T160000
DTSTAMP:20260416T062454
CREATED:20230426T033033Z
LAST-MODIFIED:20230426T033531Z
UID:2270-1683644400-1683648000@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Fano 3-folds\, Lagrangian Fibration and Leech-K3 Geometry II
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nPDF file
URL:https://ccg.ibs.re.kr/event/2023-05-09-1500-1600/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230509T110000
DTEND;TZID=Asia/Seoul:20230509T120000
DTSTAMP:20260416T062454
CREATED:20230426T032901Z
LAST-MODIFIED:20230426T033514Z
UID:2267-1683630000-1683633600@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Fano 3-folds\, Lagrangian Fibration and Leech-K3 Geometry I
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nPDF file
URL:https://ccg.ibs.re.kr/event/2023-05-09-1100-1200/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
END:VCALENDAR