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PRODID:-//Center for Complex Geometry - ECPv6.15.20//NONSGML v1.0//EN
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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:20230101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241127T160000
DTEND;TZID=Asia/Seoul:20241127T170000
DTSTAMP:20260416T073611
CREATED:20241029T022418Z
LAST-MODIFIED:20241029T022418Z
UID:3485-1732723200-1732726800@ccg.ibs.re.kr
SUMMARY:Izzet Coskun\, The Geometry of Moduli Spaces of Sheaves on P2
DESCRIPTION:    Speaker\n\n\nIzzet Coskun\nUniversity of Illinois Chicago\n\n\n\n\n\n\nIn this talk\, I will explain how to use Bridgeland stability conditions to compute the ample and effective cones of moduli spaces of sheaves on the projective plane. I will describe the birational geometry of these moduli spaces and give applications to the higher rank interpolation problem. This talk is based on joint work with Jack Huizenga\, John Kopper and Matthew Woolf.
URL:https://ccg.ibs.re.kr/event/2024-1127/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241112T160000
DTEND;TZID=Asia/Seoul:20241112T170000
DTSTAMP:20260416T073611
CREATED:20240930T082034Z
LAST-MODIFIED:20241111T063450Z
UID:3357-1731427200-1731430800@ccg.ibs.re.kr
SUMMARY:Giancarlo Urzua\, The Birational Geometry of Markov Numbers
DESCRIPTION:    Speaker\n\n\nGiancarlo Urzua\nPontificia Universidad Catolica de Chile\n\n\n\n\n\n\nThe projective plane is rigid. However\, it may degenerate to surfaces with quotient singularities. After the work of Bădescu and Manetti\, Hacking and Prokhorov 2010 classified these degenerations completely. They are Q-Gorenstein partial smoothings of P(a2\, b2\, c2)\, where a\, b\, c satisfy the Markov equation x2+y2+z2=3xyz. Let us call the corresponding degenerations Markovian planes. They are part of a bigger picture of degenerations with Wahl singularities\, where there is an explicit MMP whose final results are either K nef\, smooth deformations of ruled surfaces\, or Markovian planes. Although it is a final result of MMP\, we can nevertheless run MMP on small modifications of Markovian planes to obtain new numerical/combinatorial data for Markov numbers via birational geometry. New connections with Markov conjecture (i.e. Frobenius Uniqueness Conjecture) are byproducts. This is joint work with Juan Pablo Zúñiga (Ph.D. student at UC Chile)\, the pre-print can be found here https://arxiv.org/abs/2310.17957.
URL:https://ccg.ibs.re.kr/event/2024-1112/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20241108
DTEND;VALUE=DATE:20241114
DTSTAMP:20260416T073611
CREATED:20240930T083348Z
LAST-MODIFIED:20240930T084043Z
UID:3366-1731024000-1731542399@ccg.ibs.re.kr
SUMMARY:Giancarlo Urzua (Pontificia Universidad Catolica de Chile)
DESCRIPTION:Giancarlo Urzua \nVisitor (2024.11.8-2024.11.13) from Pontificia Universidad Catolica de Chile \nOffice: –
URL:https://ccg.ibs.re.kr/event/giancarlo-urzua-241108-241113/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241029T160000
DTEND;TZID=Asia/Seoul:20241029T170000
DTSTAMP:20260416T073611
CREATED:20240930T081825Z
LAST-MODIFIED:20241014T060435Z
UID:3353-1730217600-1730221200@ccg.ibs.re.kr
SUMMARY:Naoto Yotsutani\, Bott Manifolds with the Strong Calabi Dream Structure
DESCRIPTION:    Speaker\n\n\nNaoto Yotsutani\nKagawa university\n\n\n\n\n\n\nWe prove that if the Futaki invariant of a polarized Bott manifold (X\, L) for any ample line bundle L vanishes\, then X is isomorphic to the products of the projective lines. This talk is based on a work joint with Kento Fujita (algebro-geometrical approach)\, and another independent work joint with Hajime Ono and Yuji Sano (convex geometrical approach).
URL:https://ccg.ibs.re.kr/event/2024-1029/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20241026
DTEND;VALUE=DATE:20241030
DTSTAMP:20260416T073611
CREATED:20240930T083008Z
LAST-MODIFIED:20241014T060511Z
UID:3364-1729900800-1730246399@ccg.ibs.re.kr
SUMMARY:Naoto Yotsutani (Kagawa University)
DESCRIPTION:Naoto Yotsutani \nVisitor (2024.10.26-2024.10.29) from Kagawa University \nOffice: –
URL:https://ccg.ibs.re.kr/event/naoto-yotsutani-241026-241029/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241022T160000
DTEND;TZID=Asia/Seoul:20241022T170000
DTSTAMP:20260416T073611
CREATED:20241017T051012Z
LAST-MODIFIED:20241017T051012Z
UID:3397-1729612800-1729616400@ccg.ibs.re.kr
SUMMARY:David Sykes\, CR Hypersurfaces\, Studying 2-nondegenerate Structures via Absolute Parallelisms
DESCRIPTION:    Speaker\n\n\nDavid Sykes\nIBS CCG\n\n\n\n\n\n\nThe basic problem of finding (local) biholomorphisms mapping one real hypersurface in a complex space onto another is only well understood for a limited class of hypersurfaces\, and has a fundamental relationship to their induced CR geometries. Following a light historical survey of major results in the area\, this talk will present a solution to the local equivalence problem for 2-nondegenerate CR hypersurfaces\, developed in joint work with Igor Zelenko\, given by canonically encoding the geometries into absolute parallelisms.
URL:https://ccg.ibs.re.kr/event/2024-1022/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241015T140000
DTEND;TZID=Asia/Seoul:20241015T150000
DTSTAMP:20260416T073611
CREATED:20240930T081700Z
LAST-MODIFIED:20241007T061212Z
UID:3350-1729000800-1729004400@ccg.ibs.re.kr
SUMMARY:Justin Lacini\, On Log del Pezzo Surfaces in Positive Characteristic
DESCRIPTION:    Speaker\n\n\nJustin Lacini\nPrinceton university\n\n\n\n\n\n\nA log del Pezzo surface is a normal surface with only Kawamata log terminal singularities and anti-ample canonical class. Over the complex numbers\, Keel and McKernan have classified all but a bounded family of log del Pezzo surfaces of Picard number one. In this talk we will extend their classification to positive characteristic. In particular\, we will prove that for p>3 every log del Pezzo surface of Picard number one admits a log resolution that lifts to characteristic zero over a smooth base. As a consequence\, we will see that Kawamata-Viehweg vanishing holds in this setting. Finally\, we will conclude with some counterexamples in characteristic two\, three and five.
URL:https://ccg.ibs.re.kr/event/2024-1015/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241014T160000
DTEND;TZID=Asia/Seoul:20241014T170000
DTSTAMP:20260416T073611
CREATED:20240930T081445Z
LAST-MODIFIED:20241007T061046Z
UID:3348-1728921600-1728925200@ccg.ibs.re.kr
SUMMARY:Changho Han\, Trigonal Curves and Associated K3 Surfaces
DESCRIPTION:    Speaker\n\n\nChangho Han\nKorea university\n\n\n\n\n\n\nK3 surfaces\, as a generalization of elliptic curves\, have a rich amount of geometric properties. Recalling that elliptic curves are double covers of rational curves branched over 4 distinct points\, there are K3 surfaces that are cyclic triple covers of rational surfaces; Artebani and Sarti classified such generic K3 surfaces depending on lattice invariants. Such K3 surfaces admit Kulikov and KSBA degenerations\, each leading to toroidal and KSBA compactifications of the moduli spaces of such K3 surfaces. As joint works in progress with Valery Alexeev\, Anand Deopurkar\, and Philip Engel\, I will explain how to use trigonal curves (triple covers of rational curves) to obtain aforementioned degenerations\, leading to more explicit understandings of boundaries of those compactifications: such as classifications of generic members and the dimensions.
URL:https://ccg.ibs.re.kr/event/2024-1014/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20241013
DTEND;VALUE=DATE:20241015
DTSTAMP:20260416T073611
CREATED:20240930T082712Z
LAST-MODIFIED:20240930T082712Z
UID:3359-1728777600-1728950399@ccg.ibs.re.kr
SUMMARY:Changho Han (한창호\, Korea University)
DESCRIPTION:Changho Han (한창호) \nVisitor (2024.10.13-2024.10.14) from Korea University \nOffice: –
URL:https://ccg.ibs.re.kr/event/changho-han-241013-241014/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240822T160000
DTEND;TZID=Asia/Seoul:20240822T170000
DTSTAMP:20260416T073611
CREATED:20240816T065946Z
LAST-MODIFIED:20240819T044606Z
UID:3270-1724342400-1724346000@ccg.ibs.re.kr
SUMMARY:Xiaojun Huang\, Bounding a Levi-flat Hypersurface in a Stein Manifold
DESCRIPTION:    Speaker\n\n\nXiaojun Huang\nRutgers Univ\n\n\n\n\n\n\nLet M be a smooth real codimension two compact submanifold in a Stein manifold. We will prove the following theorem: Suppose that M has two elliptic complex tangents and suppose CR points are non-minimal. Assume further that M is contained in a bounded strongly pseudoconvex domain. Then M bounds a unique smooth up to M Levi flat hypersurface M̂ that is foliated by Stein subspace diffeomorphic to the ball. Moreover\, M̂ is the hull of holomorphy of M. This subject has a long history of investigation from E. Bishop and Harvey-Lawson. I will discuss both the history and techniques used  in the proof of the above mentioned theorem.
URL:https://ccg.ibs.re.kr/event/2024-0822/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240807T160000
DTEND;TZID=Asia/Seoul:20240807T173000
DTSTAMP:20260416T073611
CREATED:20240717T002901Z
LAST-MODIFIED:20240717T002901Z
UID:3201-1723046400-1723051800@ccg.ibs.re.kr
SUMMARY:Chuyu Zhou\, Lecture 2: Non-linear Wall Crossing Theory
DESCRIPTION:    Speaker\n\n\nChuyu Zhou\nYonsei University\n\n\n\n\n\n\nIn this lecture\, we will talk about two properties of K-semistable domains in non-proportional setting. One is the finiteness criterion\, which states that the number of domains is finite for a family of couples. The other is about the shape of each domain\, which states that they are semi-algebraic sets. These two properties together lead to a satisfactory wall crossing theory for K-stability in non-proportional case. Time permits\, I will present a comparison between GIT-stability and K-stability in non-proportional setting.
URL:https://ccg.ibs.re.kr/event/2024-0807/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240806T160000
DTEND;TZID=Asia/Seoul:20240806T173000
DTSTAMP:20260416T073611
CREATED:20240717T002726Z
LAST-MODIFIED:20240717T002726Z
UID:3199-1722960000-1722965400@ccg.ibs.re.kr
SUMMARY:Chuyu Zhou\, Lecture 1: Constructible Properties of Various Domains for a Family of Couples
DESCRIPTION:    Speaker\n\n\nChuyu Zhou\nYonsei University\n\n\n\n\n\n\nIn this lecture\, I will recall some basic knowledge on K-stability and some background on wall crossing in proportional setting. Then we plan to conduct a comparison between proportional case and non-proportional case. Under the comparison\, we will define several domains associated to a family of couples and present their constructible properties.
URL:https://ccg.ibs.re.kr/event/2024-0806/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240806T140000
DTEND;TZID=Asia/Seoul:20240806T150000
DTSTAMP:20260416T073611
CREATED:20240724T083214Z
LAST-MODIFIED:20240724T083245Z
UID:3244-1722952800-1722956400@ccg.ibs.re.kr
SUMMARY:Sheng Meng\, On Surjective Endomorphisms of Projective Varieties
DESCRIPTION:    Speaker\n\n\nSheng Meng\nEast China Normal University\n\n\n\n\n\n\nLet X be a normal projective variety over C. Let f be a surjective endomorphism of X. In this talk\, I will try to explain our current program on the classification and the building blocks of (f\, X)\, involving two main tools: equivariant minimal model program and dynamical Iitaka fibration. Two applications on the Kawaguchi-Silverman conjecture and the Zariski dense orbit conjecture will be given. This is based on several joint works with Junyi Xie\, De-Qi Zhang and Guolei Zhong.
URL:https://ccg.ibs.re.kr/event/2024-0806-1400-1500/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240729
DTEND;VALUE=DATE:20240803
DTSTAMP:20260416T073611
CREATED:20240130T112859Z
LAST-MODIFIED:20240801T120245Z
UID:2922-1722211200-1722643199@ccg.ibs.re.kr
SUMMARY:Pacific Rim Complex and Symplectic Geometry Conference
DESCRIPTION:Invited Speakers\nDongwook Choa (KIAS\, Seoul)\nYoung-Jun Choi (Pusan National Univ.)\nSiarhei Finski (École Polytechnique)\nHervé Gaussier (Univ. Grenoble-Alpes)\nMasafumi Hattori (Kyoto Univ.)\nSiqi He (AMSS\, Beijing)\nLudmil Katzarkov (Univ. Miami)\nYusuke Kawamoto (ETH\, Zurich)\nTakayuki Koike (Osaka Metropolitan Univ.)\nYu-Shen Lin (Boston Univ.)\nGeorge Marinescu (Univ. Köln)\nYuichi Nohara (Meiji Univ.)\nSemon Rezchikov (Princeton Univ.)\nHarish Seshadri (Indian Inst. Science)\nRasul Shafikov (Univ. Western Ontario)\nLi-Sheng Tseng (U.C. Irvine)\nSeungook Yu (Postech)\nJihun Yum (Gyeongsang National Univ.)\nRuobing Zhang (Princeton Univ.)\nAndrew Zimmer (Univ. Wisconsin) \nAbstracts\nPDF file \nSchedule\nJuly 29 (Monday) \n(Morning session chaired by Jun-Muk Hwang)\n10:00-11:00 Marinescu\n11:20-12:20 Choi\n12:30-14:00 Lunch\n(Afternoon session chaired by Dano Kim)\n14:00-15:00 Nohara\n15:15-16:15 Gaussier\n16:30-17:30 Yum \nJuly 30 (Tuesday) \n(Morning session chaired by Kaoru Ono)\n10:00-11:00 Seshadri\n11:20-12:20 Kawamoto\n12:30-14:00 Lunch\n(Afternoon session chaired by Yong-Geun Oh)\n14:00-15:00 Rezchikov\n15:15-16:15 Yu\n16:30-17:30 Choa\n18:00-20:00 Banquet \nJuly 31 (Wednesday) \n(Morning session chaired by Kengo Hirachi)\n10:00-11:00 Koike\n11:20-12:20 Zhang\n12:30-14:00 Lunch\nFree Afternoon \nAugust 1 (Thursday) \n(Morning session chaired by Jae-cheon Joo)\n10:00-11:00 Zimmer\n11:20-12:20 Lin\n12:30-14:00 Lunch\n(Afternoon session chaired by Kyoung-Seog Lee)\n14:00-15:00 Katzarkov\n15:15-16:15 Finski\n16:30-17:30 Tseng \nAugust 2 (Friday) \n(Morning session chaired by Sungyeon Kim)\n9:30-10:30 He\n10:40-11:40 Hattori\n11:50-12:50 Shafikov\n12:50-14:00 Lunch \nScientific Committee\nXiuxiong Chen (Stony Brook Univ.)\nKengo Hirachi (Univ. Tokyo)\nJun-Muk Hwang (IBS-CCG)\nYong-Geun Oh (IBS-CGP & POSTECH)\nKaoru Ono (RIMS\, Kyoto)\nYongbin Ruan (Zhejiang Univ.) \nOrganizing Committee\nJun-Muk Hwang (IBS-CCG)\nSungyeon Kim (IBS-CCG)\nYong-Geun Oh (IBS-CGP & POSTECH) \nVenue\nIBS Science Culture Center\, Daejeon\, Korea \nRegistration\nPlease submit Google form. \nMore Information\n• How to get to IBS-CCG
URL:https://ccg.ibs.re.kr/event/2024-0729-0802/
LOCATION:IBS Science Culture Center\, Daejeon\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/png:https://ccg.ibs.re.kr/wp-content/uploads/2024/08/Group-Photo_Pacific-Rim-Complex-and-Symplectic-Geometry-Conference2_4800.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240626T160000
DTEND;TZID=Asia/Seoul:20240626T170000
DTSTAMP:20260416T073611
CREATED:20240527T024433Z
LAST-MODIFIED:20240613T013707Z
UID:3146-1719417600-1719421200@ccg.ibs.re.kr
SUMMARY:Jiewon Park\, Hessian Estimates\, Monotonicity Formulae\, and Applications
DESCRIPTION:    Speaker\n\n\nJiewon Park\nKAIST\n\n\n\n\n\n\nVarious monotonicity formulae have profound applications in many different problems in geometric analysis. Quite often these formulae can be derived from pointwise Hessian estimates\, also known as Li-Yau-Hamilton estimates or matrix Harnack inequalities. In this talk we will focus on this connection building upon Hessian estimates for the Green function\, leading to novel monotonicity formulae on manifolds with certain curvature lower bounds and Einstein manifolds. Some of the results have counterparts for Kähler manifolds.
URL:https://ccg.ibs.re.kr/event/2024-0626/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240625T110000
DTEND;TZID=Asia/Seoul:20240625T120000
DTSTAMP:20260416T073611
CREATED:20240420T085030Z
LAST-MODIFIED:20240520T012527Z
UID:3109-1719313200-1719316800@ccg.ibs.re.kr
SUMMARY:Euisung Park\, On Rank 3 Quadratic Equations of Projective Varieties
DESCRIPTION:    Speaker\n\n\nEuisung Park\nKorea University\n\n\n\n\n\n\nMany projective varieties are ideal-theoretically cut out by quadratic polynomials of rank less than or equal to 4. Classical constructions in projective geometry like rational normal scrolls and Segre-Veronese varieties are examples. Regarding this phenomenon\, I would like to talk about the following two results in this talk. First\, there are many projective varieties cut out ideal-theoretically by quadratic polynomials of rank 3. Second\, there is a nice structure of the locus of rank 3 quadratic equations of a projective variety.
URL:https://ccg.ibs.re.kr/event/2024-0625/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240624T160000
DTEND;TZID=Asia/Seoul:20240624T170000
DTSTAMP:20260416T073611
CREATED:20240410T121134Z
LAST-MODIFIED:20240522T084608Z
UID:3067-1719244800-1719248400@ccg.ibs.re.kr
SUMMARY:Kisun Lee\, Numerical Certification and Certified Homotopy Tracking
DESCRIPTION:    Speaker\n\n\nKisun Lee\nClemson University\n\n\n\n\n\n\nA certified algorithm produces a solution and a certificate of correctness to a problem. Numerical certification studies certified algorithms for results obtained from numerical methods in algebraic geometry. In this talk\, we discuss why numerical certification is needed in numerical algebraic geometry and introduce the Krawczyk homotopy as one of its methods. The Krawczyk homotopy exploits interval arithmetic to track the homotopy solution path without path jumping so that the correctness of its output is guaranteed. This is joint work with Timothy Duff.
URL:https://ccg.ibs.re.kr/event/2024-0624-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240624T140000
DTEND;TZID=Asia/Seoul:20240624T150000
DTSTAMP:20260416T073611
CREATED:20240410T121020Z
LAST-MODIFIED:20240522T084547Z
UID:3065-1719237600-1719241200@ccg.ibs.re.kr
SUMMARY:Kisun Lee\, Introduction to Numerical Algebraic Geometry
DESCRIPTION:    Speaker\n\n\nKisun Lee\nClemson University\n\n\n\n\n\n\nNumerical algebraic geometry employs numerical techniques for problems in algebraic geometry. This talk begins with a question reminding the meaning of solving a (polynomial) equation. It overviews the homotopy continuation as a method for finding solutions to a system of polynomial equations. After problems from algorithmic and application points of view in numerical nonlinear algebra are introduced\, we discuss how the results from numerical techniques can be certified. No pre-knowledge from graduate-level algebraic geometry is assumed.
URL:https://ccg.ibs.re.kr/event/2024-0624-1400-1500/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240618T110000
DTEND;TZID=Asia/Seoul:20240618T120000
DTSTAMP:20260416T073611
CREATED:20240410T120832Z
LAST-MODIFIED:20240610T000025Z
UID:3063-1718708400-1718712000@ccg.ibs.re.kr
SUMMARY:Myeongjae Lee\, Connected Components of the Strata of Residueless Meromorphic Differentials
DESCRIPTION:Zoom ID: 880 6763 5837\nPW: 312515 \n\n\n    Speaker\n\n\nMyeongjae Lee\nStony Brook University\n\n\n\n\n\n\nStrata of differentials are interesting objects studied in various fields such as Teichmuller dynamics\, topology and algebraic geometry. Generalized strata are subsets of the strata of meromorphic differentials\, where certain sets of residues summing up to zero. We present the classification of the connected components of the strata of residueless meromorphic differentials\, using a degeneration technique to the boundary of a nice compactification of strata.
URL:https://ccg.ibs.re.kr/event/2024-0618/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240613T110000
DTEND;TZID=Asia/Seoul:20240613T120000
DTSTAMP:20260416T073611
CREATED:20240411T030606Z
LAST-MODIFIED:20240603T194549Z
UID:3070-1718276400-1718280000@ccg.ibs.re.kr
SUMMARY:Cheol Hyun Cho\, Floer Theory for the Variation Operator of an Isolated Singularity
DESCRIPTION:    Speaker\n\n\nCheol Hyun Cho\nSeoul National University\n\n\n\n\n\n\nThe variation operator in singularity theory maps relative homology cycles to compact cycles in the Milnor fiber using the monodromy. We construct its symplectic analogue for an isolated singularity. We define a new Floer cohomology\, called monodromy Lagrangian Floer cohomology\, which provides categorifications of the standard theorems on the variation operator and the Seifert form. We discuss examples of plane curve singularities and explain the relation between exceptional collections of non-compact curves and distinguished collections of vanishing cycles.
URL:https://ccg.ibs.re.kr/event/2024-0613/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240611T160000
DTEND;TZID=Asia/Seoul:20240611T170000
DTSTAMP:20260416T073611
CREATED:20240425T082421Z
LAST-MODIFIED:20240529T003804Z
UID:3117-1718121600-1718125200@ccg.ibs.re.kr
SUMMARY:Eric Sommers\, Some Slodowy Slices Associated to Special Nilpotent Orbits
DESCRIPTION:    Speaker\n\n\nEric Sommers\nUniversity of Massachusetts\n\n\n\n\n\n\nAmong the nilpotent orbits in a simple Lie algebra are the special nilpotent orbits\, which play an important role in representation theory. Some of the geometry of the closure of a nilpotent orbit can be understood by taking a transverse slice to a smaller orbit in the closure. This talk concerns a classification of two types of such transverse slices: (1) those between adjacent special nilpotent orbits; and (2) those between a special nilpotent orbit and a certain non-special nilpotent orbit in its closure. The slices in part (1) exhibit a duality\, which extends an observation of Kraft and Procesi for type A. The slices in part (2) are related to a conjecture of Lusztig on special pieces.  This talk is based on two preprints with Baohua Fu\, Daniel Juteau\, and Paul Levy.
URL:https://ccg.ibs.re.kr/event/2024-0611-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240611T110000
DTEND;TZID=Asia/Seoul:20240611T120000
DTSTAMP:20260416T073611
CREATED:20240410T120654Z
LAST-MODIFIED:20240610T000002Z
UID:3061-1718103600-1718107200@ccg.ibs.re.kr
SUMMARY:Minyoung Jeon\, Prym-Brill-Noether Loci and Prym-Petri Theorem
DESCRIPTION:Zoom ID: 880 6763 5837\nPW: 312515 \n\n\n    Speaker\n\n\nMinyoung Jeon\nUniversity of Georgia\n\n\n\n\n\n\nPrym varieties are abelian varieties constructed from etale double covers of algebraic curves. In 1985\, Welters equipped Prym varieties with Brill-Noether loci. In this talk\, we will describe the Prym-Brill-Noether loci with special vanishing at up to two marked points and will then give K-classes of the pointed and two-pointed Prym-Brill-Noether locus. As applications of the K-class formulas of the Prym-Brill-Noether loci\, we will also provide formulas for Euler characteristics of the pointed Prym-Brill-Noether loci and coupled Prym-Petri theorem.
URL:https://ccg.ibs.re.kr/event/2024-0611-1100-1200/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240523T110000
DTEND;TZID=Asia/Seoul:20240523T120000
DTSTAMP:20260416T073611
CREATED:20240229T044631Z
LAST-MODIFIED:20240508T084936Z
UID:2973-1716462000-1716465600@ccg.ibs.re.kr
SUMMARY:Sung Rak Choi\, Adjoint Asymptotic Multiplier Ideal Sheaves
DESCRIPTION:    Speaker\n\n\nSung Rak Choi\nYonsei University\n\n\n\n\n\n\nIn this talk\, we define and study a triple called a potential triple which consists of a pair (X\, Δ) and a polarizing pseudoeffective divisor D. \nTo such a triple\, we define a so-called potential multiplier ideal sheaf which gives a simultaneous generalization of the multiplier ideal sheaf and asymptotic multiplier ideal sheaf. We give a description of the closed subset defined by potential multiplier ideal sheaf in terms of the minimal model program. We also characterize the case where potential multiplier ideal sheaf is trivial. Lastly\, we also prove a Nadel type vanishing theorem of cohomology for potential multiplier ideal sheaf. We further present applications of the theory of potential triples. This is a joint work with S.Jang and D.Kim.
URL:https://ccg.ibs.re.kr/event/2024-0523/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240522T160000
DTEND;TZID=Asia/Seoul:20240522T170000
DTSTAMP:20260416T073611
CREATED:20240410T120510Z
LAST-MODIFIED:20240513T070853Z
UID:3059-1716393600-1716397200@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Moduli of Abelian Surfaces\, Polyhedral Groups and Fano 3-folds of Degree 22 (Part 2)
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nI will discuss the moduli space of abelian surfaces with bi-level structure of type (1\, d) for d = 2\, 3\, 4\, 5. \nPart 1: Their Satake compactification is the projective 3-space P3 for d = 2\, 3\, 4. \nPart 2: It is a small contraction of the blow-up of P3 at 60 points for d = 5. I give two proofs. One is analytic and uses good automorphic forms constructed by Gritsenko-Nilulin. The other is algebraic and uses U22\, one of the Umemura 3-folds\, and Reye congruences.
URL:https://ccg.ibs.re.kr/event/2024-0522/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240521T160000
DTEND;TZID=Asia/Seoul:20240521T170000
DTSTAMP:20260416T073611
CREATED:20240410T120353Z
LAST-MODIFIED:20240507T000023Z
UID:3057-1716307200-1716310800@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Moduli of Abelian Surfaces\, Polyhedral Groups and Fano 3-folds of Degree 22 (Part 1)
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nI will discuss the moduli space of abelian surfaces with bi-level structure of type (1\, d) for d = 2\, 3\, 4\, 5. \nPart 1: Their Satake compactification is the projective 3-space P3 for d = 2\, 3\, 4. \nPart 2: It is a small contraction of the blow-up of P3 at 60 points for d = 5. I give two proofs. One is analytic and uses good automorphic forms constructed by Gritsenko-Nilulin. The other is algebraic and uses U22\, one of the Umemura 3-folds\, and Reye congruences.
URL:https://ccg.ibs.re.kr/event/2024-0521/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240517T160000
DTEND;TZID=Asia/Seoul:20240517T170000
DTSTAMP:20260416T073611
CREATED:20240308T031917Z
LAST-MODIFIED:20240422T004620Z
UID:3014-1715961600-1715965200@ccg.ibs.re.kr
SUMMARY:Jungkai Chen\, Threefold Divisorial Contraction to Curves
DESCRIPTION:    Speaker\n\n\nJungkai Chen\nNational Taiwan University\n\n\n\n\n\n\nThe minimal model program works pretty well in dimension three. However\, the explicit classification of divisorial contractions to points was completed quite recently thanks to the work of Kawamata\, Hayakawa\, Kawakita and more. In this talk\, we are going to describe threefold divisorial contractions to curves. We will demonstrate some more possible higher dimensional extensions. This is joint work in progress with Jheng-Jie Chen and Hsin-Ku Chen.
URL:https://ccg.ibs.re.kr/event/2024-0517/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240514
DTEND;VALUE=DATE:20240517
DTSTAMP:20260416T073611
CREATED:20240305T011448Z
LAST-MODIFIED:20240517T022906Z
UID:2985-1715644800-1715903999@ccg.ibs.re.kr
SUMMARY:Workshop on Algebraic Geometry in Busan
DESCRIPTION:Speakers\nLorenzo Barban (IBS-CCG)\nJungkai Chen (National Taiwan University)\nToshiyuki Katsura (University of Tokyo)\nShigeyuki Kondo (Nagoya University)\nChing-Jui Lai (National Cheung Kung University)\nDonggun Lee (IBS-CCG)\nHsueh-Yung Lin (National Taiwan University)\nShigeru Mukai (Kyoto University)\nKeiji Oguiso (University of Tokyo) \nAbstracts\nPDF file \nSchedule\nMay 14 (Tuesday) \n14:00~14:20 Registration\n14:20~15:20 Oguiso\n15:40~16:40 Lai\n17:00~18:00 Lin\n18:30~20:30 Dinner \nMay 15 (Wednesday) \n09:30~10:30 Katsura\n11:00~12:00 Kondo\n12:00~13:30 Lunch\n13:30~17:30 Discussion\n18:00~20:00 Banquet \nMay 16 (Thursday) \n09:30~10:30 Chen\n11:00~12:00 Barban\n12:00~13:30 Lunch\n13:30~14:30 Lee\n15:00~16:00 Mukai \nOrganizers\nJongHae Keum (KIAS)\nYongnam Lee (IBS-CCG/KAIST) \nVenue\nLa Valse Hotel\, Busan \n* Due to available hotel rooms and budgets\, participation is by invitation only. If you are interested to participate in this workshop\, please contact one of the organizers by April 15.
URL:https://ccg.ibs.re.kr/event/2024-0514-0516/
LOCATION:La Valse Hotel\, Busan\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/jpeg:https://ccg.ibs.re.kr/wp-content/uploads/2024/05/IMG_6536-scaled.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T160000
DTEND;TZID=Asia/Seoul:20240513T170000
DTSTAMP:20260416T073611
CREATED:20240308T031735Z
LAST-MODIFIED:20240420T084747Z
UID:3011-1715616000-1715619600@ccg.ibs.re.kr
SUMMARY:Ching-Jui Lai\, Anticanonical Volume of Singular Fano Threefolds
DESCRIPTION:    Speaker\n\n\nChing-Jui Lai\nNational Cheung Kung University\n\n\n\n\n\n\nThe set of canonical Fano threefolds form a bounded family by results of Kawamata\, Mori-Miyaoka-Kollar-Tagaki\, and in a much more general setting by Birkar. In particular\, the anticaonical volume –KX3 is bounded. An optimal lower bound is 1/330 by the work of Chen-Chen. In this talk\, we discuss the problem of identifying an optimal upper bound of –KX3.
URL:https://ccg.ibs.re.kr/event/2024-0513-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T143000
DTEND;TZID=Asia/Seoul:20240513T153000
DTSTAMP:20260416T073611
CREATED:20240308T031601Z
LAST-MODIFIED:20240422T004325Z
UID:3009-1715610600-1715614200@ccg.ibs.re.kr
SUMMARY:Hsueh-Yung Lin\, Motivic Invariants of Birational Automorphisms of Threefolds
DESCRIPTION:    Speaker\n\n\nHsueh-Yung Lin\nNational Taiwan University\n\n\n\n\n\n\nThe motivic invariant c(f) of a birational automorphism f : X – → X measures the difference between the birational types of the exceptional divisors of f and those of the inverse f-1. In general c(f) is nonzero: this is the case when f is some Cremona transformation\, which leads to new explanation as to why Cremona groups are not simple. In the other direction\, which will be the main focus of the talk\, we show that the invariant c(f) always vanishes when X is a complex projective threefold. (joint work in progress with E. Shinder.)
URL:https://ccg.ibs.re.kr/event/2024-0513-1430-1530/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240508T110000
DTEND;TZID=Asia/Seoul:20240508T120000
DTSTAMP:20260416T073611
CREATED:20240308T031423Z
LAST-MODIFIED:20240308T031423Z
UID:3006-1715166000-1715169600@ccg.ibs.re.kr
SUMMARY:Shigeyuki Kondo\, A Review on Enriques Surfaces: Moduli\, Automorphism Groups and Positive Characteristics\, II
DESCRIPTION:    Speaker\n\n\nShigeyuki Kondo\nNagoya University\n\n\n\n\n\n\nThe Enriques surface was discovered\, in 1894 by Federigo Enriques\, as a counter-example of a rationality problem.\nFirst I would like to recall the moduli space and the automorphism groups of Enriques surfaces over the complex numbers.\nIn the later half\, I shall mention a recent progress in positive characteristic\, especially in characteristic two.
URL:https://ccg.ibs.re.kr/event/2024-0508/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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END:VCALENDAR