BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Center for Complex Geometry - ECPv6.16.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://ccg.ibs.re.kr
X-WR-CALDESC:Events for Center for Complex Geometry
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20210101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220208T110000
DTEND;TZID=Asia/Seoul:20220208T120000
DTSTAMP:20260615T013026
CREATED:20220208T020000Z
LAST-MODIFIED:20220126T010701Z
UID:975-1644318000-1644321600@ccg.ibs.re.kr
SUMMARY:Sandor Kovacs\, Hodge Sheaves for Singular Families
DESCRIPTION:     Speaker\n\n\nSandor Kovacs\nUniv. of Washington\n\n\n\n\n\nThis is a report on joint work with Behrouz Taji. Given a flat projective morphism f : X → B of complex varieties\, assuming that B is smooth\, we construct a functorial system of reflexive Hodge sheaves on B . If in addition\, X is also smooth then this system gives an extension of the Hodge bundle underlying the VHS of the smooth locus of f . This in turn provides a criterion that all VHSs of geometric origin must satisfy. As an independent application we prove a singular version of Viehweg’s conjecture about base spaces of families of maximal variation.
URL:https://ccg.ibs.re.kr/event/2022-02-08/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220210T110000
DTEND;TZID=Asia/Seoul:20220210T120000
DTSTAMP:20260615T013026
CREATED:20220210T020000Z
LAST-MODIFIED:20220124T121022Z
UID:1027-1644490800-1644494400@ccg.ibs.re.kr
SUMMARY:Young-Hoon Kiem\, A New Construction of the Moduli Space of Pointed Stable Curves of Genus 0
DESCRIPTION:     Speaker\n\n\nYoung-Hoon Kiem\nSeoul National University\n\n\n\n\n\nThe moduli space of n points on a projective line up to projective equivalence has been a topic of research since the 19th century. A natural moduli theoretic compactification was constructed by Deligne and Mumford as an algebraic stack. Later\, Knudsen\, Keel\, Kapranov and others provided explicit constructions by sequences of blowups. The known inductive constructions of Knudsen and Keel however are rather inconvenient when one wants to compute the cohomology of the compactified moduli space as a representation space of its automorphism group because the blowup sequences are not equivariant. I will talk about a new inductive construction of the much studied moduli space from the perspective of sheaf theory. In fact\, we consider the moduli space of rank 1 stable pairs over the moduli space of n pointed stable curves of genus 0. By studing the wall crossing\, we obtain an equivariant sequence of blowups which ends up with the moduli space of n+1 pointed stable curves of genus 0. As an application\, we provide a closed formula of the character of the cohomology of the moduli space. We also provide a partial answer to a question of Manin and Orlov which asks whether the cohomology is a permutation representation or not. Based on a joint work with Jinwon Choi and Donggun Lee.
URL:https://ccg.ibs.re.kr/event/2022-02-10/
LOCATION:TBA
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220216T110000
DTEND;TZID=Asia/Seoul:20220216T120000
DTSTAMP:20260615T013026
CREATED:20220216T020000Z
LAST-MODIFIED:20220212T105153Z
UID:987-1645009200-1645012800@ccg.ibs.re.kr
SUMMARY:Chenyang Xu\, K-stability of Fano Varieties
DESCRIPTION:     Speaker\n\n\nChenyang Xu\nPrinceton Univ.\n\n\n\n\n\nK-stability of Fano varieties was initiated as a central topic in complex geometry\, for its relation with the Kähler-Einstein metric. It turns out that the machinery of higher dimensional geometry\, developed around the minimal model program\, provides a fundamental tool to study it\, and therefore makes it an active algebraic subject. This meeting of two well-studied fields has made a number of major conjectures solved. In this talk\, I will survey the recent development.
URL:https://ccg.ibs.re.kr/event/2022-02-16-1100/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220216T150000
DTEND;TZID=Asia/Seoul:20220216T170000
DTSTAMP:20260615T013026
CREATED:20220212T104813Z
LAST-MODIFIED:20220212T104813Z
UID:1124-1645023600-1645030800@ccg.ibs.re.kr
SUMMARY:Gunhee Cho\, The Lower Bound of the Integrated Carathéodory-Reiffen Metric and Invariant Metrics on Complete Noncompact Kähler Manifolds
DESCRIPTION:     Speaker\n\n\nGunhee Cho\nUCSB\n\n\n\n\n\nWe seek to gain progress on the following long-standing conjectures in hyperbolic complex geometry: prove that a simply connected complete Kähler manifold with negatively pinched sectional curvature is biholomorphic to a bounded domain and the Carathéodory-Reiffen metric does not vanish everywhere. As the next development of the important recent results of D. Wu and S.T. Yau in obtaining uniformly equivalence of the base Kähler metric with the Bergman metric\, the Kobayashi-Royden metric\, and the complete Kähler-Einstein metric in the conjecture class but missing of the Carathéodory-Reiffen metric\, we provide an integrated gradient estimate of the bounded holomorphic function which becomes a quantitative lower bound of the integrated Carathéodory-Reiffen metric. Also\, without requiring the negatively pinched holomorphic sectional curvature condition of the Bergman metric\, we establish the equivalence of the Bergman metric\, the Kobayashi-Royden metric\, and the complete Kähler-Einstein metric of negative scalar curvature under a bounded curvature condition of the Bergman metric on an n-dimensional complete noncompact Kähler manifold with some reasonable conditions which also imply non-vanishing Carathédoroy-Reiffen metric. This is a joint work with Kyu-Hwan Lee.
URL:https://ccg.ibs.re.kr/event/2022-02-16-1500/
LOCATION:on-line
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20220222
DTEND;VALUE=DATE:20220223
DTSTAMP:20260615T013026
CREATED:20220221T150000Z
LAST-MODIFIED:20220207T010959Z
UID:1045-1645488000-1645574399@ccg.ibs.re.kr
SUMMARY:Arithemetic Geometry Day in IBS-CCG
DESCRIPTION:List of Seminars \n\n\n\n\n\nA Hyperelliptic Curve Mapping to Specified Elliptic Curves\nBo-Hae Im (KAIST)\n14:00-15:00\, IBS B266 \n\n\nJordan Constants of Simple Abelian Varieties over Fields of Positive Characteristic\nWonTae Hwang (Jeonbuk National Univ.)\n15:15-16:15\, IBS B266 \n\n\nDecidable Diophantine Problems on Character Varieties\nJunho Peter Whang (Seoul National Univ.)\n16:30-17:30\, IBS B266
URL:https://ccg.ibs.re.kr/event/2022-02-22/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220222T140000
DTEND;TZID=Asia/Seoul:20220222T150000
DTSTAMP:20260615T013026
CREATED:20220222T050000Z
LAST-MODIFIED:20220207T011418Z
UID:1049-1645538400-1645542000@ccg.ibs.re.kr
SUMMARY:Bo-Hae Im\, A Hyperelliptic Curve Mapping to Specified Elliptic Curves
DESCRIPTION:     Speaker\n\n\nBo-Hae Im\nKAIST\n\n\n\n\n\n\n(This is a part of Arithemetic Geometry Day in IBS-CCG.) \nWe are interested in the existence and non-existence of rational curves on certain Kummer varieties which can be applied to the rank problem of quadratic twists of elliptic curves. In this talk\, we prove that if the j-invariants of a 21-tuple of elliptic curves E1\, …\, E21 over C are algebraically independent over Q\, there is no hyperelliptic curve which admits a non-trivial morphism to each of the Ei\, which shows the non-existence of rational curves of the Kummer variety of the products of more than 20 elliptic curves.\nThis is a joint work with Michael Larsen and Sailun Zhan.
URL:https://ccg.ibs.re.kr/event/2022-02-22-1400/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220222T151500
DTEND;TZID=Asia/Seoul:20220222T161500
DTSTAMP:20260615T013026
CREATED:20220222T061500Z
LAST-MODIFIED:20220207T011550Z
UID:1052-1645542900-1645546500@ccg.ibs.re.kr
SUMMARY:WonTae Hwang\, Jordan Constants of Simple Abelian Varieties over Fields of Positive Characteristic
DESCRIPTION:     Speaker\n\n\nWonTae Hwang\nJeonbuk National Univ.\n\n\n\n\n\n\n(This is a part of Arithemetic Geometry Day in IBS-CCG.) \nWe compute the Jordan constants of simple abelian surfaces over fields of positive characteristic\, with the aid of a similar computation on the Jordan constants of some arithmetic objects. As an update\, we also briefly record a similar recent result on the case of simple abelian fourfolds over finite fields.
URL:https://ccg.ibs.re.kr/event/2022-02-22-1515/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220222T163000
DTEND;TZID=Asia/Seoul:20220222T173000
DTSTAMP:20260615T013026
CREATED:20220222T073000Z
LAST-MODIFIED:20220207T011657Z
UID:1055-1645547400-1645551000@ccg.ibs.re.kr
SUMMARY:Junho Peter Whang\, Decidable Diophantine Problems on Character Varieties
DESCRIPTION:     Speaker\n\n\nJunho Peter Whang\nSeoul National Univ.\n\n\n\n\n\n\n(This is a part of Arithemetic Geometry Day in IBS-CCG.) \nCharacter varieties of manifolds are basic objects in geometry and low-dimensional topology. We motivate the Diophantine study of their integral points. After discussing an effective finite generation theorem for integral points on SL2-character varieties of surfaces\, we present new decidability results for certain Diophantine problems on character varieties with other coefficient groups and manifolds.
URL:https://ccg.ibs.re.kr/event/2022-02-22-1630/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220223T110000
DTEND;TZID=Asia/Seoul:20220223T120000
DTSTAMP:20260615T013026
CREATED:20220223T020000Z
LAST-MODIFIED:20220221T054117Z
UID:1136-1645614000-1645617600@ccg.ibs.re.kr
SUMMARY:Kang-Hyurk Lee\, Smoothly Bounded Domain with a Compact Quotient
DESCRIPTION:     Speaker\n\n\nKang-Hyurk Lee\nGNU\n\n\n\n\n\nThe Wong-Rosay theorem says that a smoothly bounded domain covering a compact complex manifold is biholomorphically equivalent to the unit ball. The general methodology of this theorem is the affine rescaling method. In this talk\, I will introduce the potential rescaling method\, an alternative of the affine rescaling. This is a method to construct a specific potential function of the Kahler-Einstein which possesses a complete holomorphic vector field. I will also give a generalization of the Wong-Rosay theorem. This is a collaborated work with Y.-J. Choi and A. Seo.
URL:https://ccg.ibs.re.kr/event/2022-02-23/
LOCATION:on-line
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220224T110000
DTEND;TZID=Asia/Seoul:20220224T120000
DTSTAMP:20260615T013026
CREATED:20220224T020000Z
LAST-MODIFIED:20220126T041807Z
UID:1077-1645700400-1645704000@ccg.ibs.re.kr
SUMMARY:Jeong-Seop Kim\, Positivity of Tangent Bundles of Fano Threefolds
DESCRIPTION:     Speaker\n\n\nJeong-Seop Kim\nKAIST\n\n\n\n\n\nAs well as the Hartshorne-Frankel conjecture on the ampleness of tangent bundle\, it has been asked to characterize a smooth projective variety X whose tangent bundle TX attains certain positivity\, e.g.\, nefness\, k-ampleness\, or bigness. But for the ampleness\, the complete answers are not known even within the class of smooth Fano varieties\, only partial answers are known in the case of lower dimension or lower Picard number\, some of which rely on classification theorems. On the bigness of TX\, the characterization has been done recently in the case of dimension 2 (Höring-Liu-Shao) and dimension 3 with Picard number 1 (Höring-Liu) using a special divisor on P(TX)\, called the total dual VMRT. In this talk\, I will briefly review the classification of Fano threefolds and the theory of total dual VMRT. Then I will introduce some criteria to determine the bigness of TX\, and announce a result on the bigness of TX in the case of dimension 3 with higher Picard number. This is joint work with Hosung Kim and Yongnam Lee.
URL:https://ccg.ibs.re.kr/event/2022-02-24/
LOCATION:TBA
CATEGORIES:Complex Geometry Seminar
END:VEVENT
END:VCALENDAR