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PRODID:-//Center for Complex Geometry - ECPv6.15.20//NONSGML v1.0//EN
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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:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260226T160000
DTEND;TZID=Asia/Seoul:20260226T170000
DTSTAMP:20260415T212422
CREATED:20260219T171800Z
LAST-MODIFIED:20260219T171938Z
UID:4438-1772121600-1772125200@ccg.ibs.re.kr
SUMMARY:On Slope Unstable Fano varieties
DESCRIPTION:    Speaker\n\n\nYen-An Chen\nKIAS\n\n\n\n\n\n\nFor Fano varieties\, significant progress has been made recently in the study of K-stability\, while the understanding of the weaker but more algebraic concept of $(−K)$-slope stability remains intricate. For instance\, a conjecture attributed to Iskovskikh states that the tangent bundle of a Picard rank one Fano manifold is slope stable. Peternell-Wisniewski and Hwang proved this conjecture up to dimension five in 1998\, but Kanemitsu later disproved it in 2021. To address this gap in understanding\, we present a method that aims to characterize the geometry associated with the maximal destabilizing sheaf of the tangent sheaf of a Fano variety. This approach utilizes modern advancements in the foliated minimal model program. In dimension two\, our approach leads to a complete classification of $(−K)$-slope unstable weak del Pezzo surfaces with canonical singularities. As by-products\, we provide the first conceptual proof that $\mathbb{P}^1 \times \mathbb{P}^1$ and $\mathbb{F}_1$ are the only $(−K)$-slope unstable nonsingular del Pezzo surfaces\, recovering a classical result of Fahlaoui in 1989. This is the joint work with Ching-Jui Lai.
URL:https://ccg.ibs.re.kr/event/on-slope-unstable-fano-varieties/
LOCATION:B236\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260227T163000
DTEND;TZID=Asia/Seoul:20260227T173000
DTSTAMP:20260415T212422
CREATED:20260219T172106Z
LAST-MODIFIED:20260220T064048Z
UID:4441-1772209800-1772213400@ccg.ibs.re.kr
SUMMARY:On the virtual cohomological dimensions of automorphism groups of K3 surfaces
DESCRIPTION:    Speaker\n\n\nTaiki Takatsu\nTokyo University of Science\n\n\n\n\n\n\nWe will discuss Mukai’s conjecture that the virtual cohomological dimension of the automorphism group of a K3 surface is equal to the maximum rank of its Mordell-Weil groups. The action of the automorphism group on the second cohomology induces a natural action on a hyperbolic space. In this talk\, we will explain that Mukai’s conjecture can be regarded as a problem in hyperbolic geometry and geometric group theory via this action. In particular\, we give the formula that determines the virtual cohomological dimension of the automorphism group of a K3 surface by the covering dimension of the blown-up boundary associated with the ample cone of the K3 surface. If time permits\, we will give an affirmative example and a counterexample of Mukai’s conjecture.
URL:https://ccg.ibs.re.kr/event/tba-2/
LOCATION:B236\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260304T160000
DTEND;TZID=Asia/Seoul:20260304T170000
DTSTAMP:20260415T212422
CREATED:20260201T161246Z
LAST-MODIFIED:20260219T171339Z
UID:4393-1772640000-1772643600@ccg.ibs.re.kr
SUMMARY:Cone structures and conic connections
DESCRIPTION:    Speaker\n\n\nKatharina Neusser\nMasaryk University\n\n\n\n\n\n\nA cone structure on a manifold $M$ is given by a closed submanifold $\mathcal C\subset \mathbb P TM$ of the projectived tangent bundle of $M$\, which is submersive over $M$. Such geometric structures arise naturally in differential and algebraic geometry and they come often equipped with a conic connection\, which specifies a distinguished family of curves on $M$ in directions of $\mathcal C$. In a joint work with Jun-Muk Hwang we defined an important local invariant for so-called characteristic conic connections\, namely the cubic torsion. In this talk I will give a geometric interpretation of the cubic torsion and will discuss some applications. This talk is based on joint work in progress with Andreas Čap.
URL:https://ccg.ibs.re.kr/event/cone-structures-and-conic-connections/
LOCATION:B236\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260310
DTEND;VALUE=DATE:20260314
DTSTAMP:20260415T212422
CREATED:20251221T002532Z
LAST-MODIFIED:20260316T073203Z
UID:4313-1773100800-1773446399@ccg.ibs.re.kr
SUMMARY:Workshop on Birational Geometry\, Moduli\, and Syzygy
DESCRIPTION:Speakers\nInvited Lecturers (three one-hour lectures) \nDawei Chen (Boston College)\nGavril Farkas (Humboldt University of Berlin)\nFrancesco Russo (University of Catania) \nInvited Speakers (one-hour talk) \nMinyoung Jeon (IBS-CCG)\nDonggun Lee (KIAS)\nLi Li (IBS-CCG) \nAbstracts\nPDF file \nSchedule\n\n\n\n\nMar 10 (Tue)\nMar 11 (Wed)\nMar 12 (Thu)\nMar 13 (Fri)\n\n\n10:00~11:00\n\nRusso\, Lec 1\nRusso\, Lec 2\nRusso\, Lec 3\n\n\n11:30~12:30\n\nChen\, Lec 1\nChen\, Lec 2\nChen\, Lec 3\n\n\n12:30~14:30\nRegistration\n(begins at 14:00)\nLunch & Discussion\nLunch & Discussion\nLunch & Discussion\n\n\n14:30~15:30\nFarkas\, Lec 1\nFarkas\, Lec 2\nFarkas\, Lec 3\n\n\n\n16:00~17:00\nLi\nJeon\nLee\n\n\n\n17:30~19:30\nDinner for Speakers\nBanquet\nDinner for Speakers\n\n\n\n\n(There will be a coffee/tea break between talks each day.) \nOrganizers\nYongnam Lee (IBS-CCG)\nJinhyung Park (KAIST) \nVenue\nB109\, IBS\, Daejeon\, Korea \nRegistration\nPlease submit Google form by February 20. \nMain Hotel\nLotte City Hotel Daejeon (4-30 Doryong-dong\, Yuseong-gu\, Daejeon) \nMore Information\n• How to get to IBS-CCG\n• From Hotel to IBS
URL:https://ccg.ibs.re.kr/event/2026-03-10-13/
LOCATION:B109\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/jpeg:https://ccg.ibs.re.kr/wp-content/uploads/2026/03/20260311-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260402T140000
DTEND;TZID=Asia/Seoul:20260402T150000
DTSTAMP:20260415T212422
CREATED:20260322T073033Z
LAST-MODIFIED:20260325T054838Z
UID:4476-1775138400-1775142000@ccg.ibs.re.kr
SUMMARY:Cylindricity of weighted singular del Pezzo surfaces defined over fields of characteristic zero
DESCRIPTION:    Speaker\n\n\nDae-Won Lee\nEwha Womans University\n\n\n\n\n\n\nThe study of cylinders in normal projective varieties is of significant interest due to their intrinsic link to unipotent group actions on affine algebraic varieties. Over a field $\mathbb{k}$ of characteristic zero\, it is known that cylindricity in lower-dimensional varieties (appearing as generic fibers) implies the existence of vertical cylinders in higher-dimensional fibered spaces. In this talk\, we give a criterion for the cylindricity of $\mathbb{k}$-forms of a singular del Pezzo surface obtained as a blow-up of a weighted projective plane. Moreover\, using the aforementioned criterion\, we construct a Fano 3-fold which contains a vertical cylinder. This is joint work with In-Kyun Kim and Masatomo Sawahara.
URL:https://ccg.ibs.re.kr/event/tba-3/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260403T140000
DTEND;TZID=Asia/Seoul:20260403T150000
DTSTAMP:20260415T212422
CREATED:20260322T073145Z
LAST-MODIFIED:20260325T054909Z
UID:4478-1775224800-1775228400@ccg.ibs.re.kr
SUMMARY:Anticanonical minimal model program: examples and applications
DESCRIPTION:    Speaker\n\n\nDae-Won Lee\nEwha Womans University\n\n\n\n\n\n\nThis talk provides a brief survey of recent results and applications concerning the anticanonical minimal model program. Furthermore\, we present examples of varieties that admit an anticanonical minimal model despite not being Mori dream spaces. This talk is based on joint work with Sung Rak Choi\, Sungwook Jang and Donghyeon Kim.
URL:https://ccg.ibs.re.kr/event/tba-4/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260527
DTEND;VALUE=DATE:20260530
DTSTAMP:20260415T212422
CREATED:20260401T071547Z
LAST-MODIFIED:20260401T071547Z
UID:4511-1779840000-1780099199@ccg.ibs.re.kr
SUMMARY:Seminar week on Moduli\, Birational Geometry\, and related topics
DESCRIPTION:Speakers\nShigeyuki Kondo (Nagoya University)\nJongHae Keum (KIAS)\nFei Si (Xi’an Jiaotong University)\nKyoung-Seog Lee (POSTECH)\nSang-Bum Yoo (Gongju National University of Education)\nJunchao Shentu (USTC)\nHaesong Seo (IBS-CCG/KAIST)\nMinzhe Zhu (KIAS)\nYen-An Chen (KIAS) \nAbstracts\nTBA \nSchedule\nMay 27(Wed) \n15:00-16:00\, Shigeyuki Kondo\n16:30-17:30\, JongHae Keum \nMay 28(Thu) \n11:00-12:00\, Fei Si\n13:30-14:30\, Kyoung-Seog Lee\n15:00-16:00\, Sang-Bum Yoo\n16:30-17:30\, Junchao Shentu \nMay 29(Fri) \n10:00-11:00\, Haesong Seo\n11:20-12:20\, Minzhe Zhu\n14:00-15:00\, Yen-An Chen \nOrganizers\nYongnam Lee (IBS-CCG) \nVenue\nB236-1\, IBS\, Daejeon\, Korea \nMore Information\n• How to get to IBS-CCG
URL:https://ccg.ibs.re.kr/event/seminar-week-on-moduli-birational-geometry-and-related-topics/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260527T110000
DTEND;TZID=Asia/Seoul:20260527T120000
DTSTAMP:20260415T212422
CREATED:20260407T060111Z
LAST-MODIFIED:20260407T060111Z
UID:4523-1779879600-1779883200@ccg.ibs.re.kr
SUMMARY:TBA
DESCRIPTION:    Speaker\n\n\nHyunmoon Kim\nEwha Womans University\n\n\n\n\n\n\nTBA
URL:https://ccg.ibs.re.kr/event/tba-5/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261109
DTEND;VALUE=DATE:20261114
DTSTAMP:20260415T212422
CREATED:20260307T152404Z
LAST-MODIFIED:20260307T152404Z
UID:4463-1794182400-1794614399@ccg.ibs.re.kr
SUMMARY:Conference on Complex Geometry
DESCRIPTION:Speakers\nRodolf Aguilar Aguilar (CIMAT\, Guanajuato)\nCong Ding (Shenzhen U.)\nCecil Gachet (U. Bochum)\nJaehyun Hong (IBS-CCG)\nXiaojun Huang (Rutgers U.)\nYuta Kusakabe (Kyushu U.)\nMinseong Kwon (AMSS\, Beijing)\nSuichung Ng (ECNU\, Shanghai)\nDan Popovici (U. Toulouse)\nVasily Rogov (MPI\, Leipzig)\nMin Ru (U. Houston)\nWilliam Sarem (U. Grenoble)\nAeryeong Seo (Kyungpook National U.)\nLaurent Stolovitch (U. Nice)\nShigeharu Takayama (U. Tokyo)\nSheng-Li Tan (ECNU\, Shanghai)\nWing-Keung To (National U. Singapore)\nI-Hsun Tsai (National Taiwan U.)\nJulie Wang (Academia Sinica\, Taipei)\nKwok Kin Wong (Shenzhen U.) \nAbstracts\nTBA \nSchedule\nTBA \nOrganizers\nPhilippe Eyssidieux (U. Grenoble)\nJun-Muk Hwang (IBS-CCG)\nSung Yeon Kim (IBS-CCG)\nNgaiming Mok (U. Hong Kong) \nVenue\nScience Culture Center\, IBS\, Daejeon\, Korea \nMore Information\n• How to get to IBS-CCG
URL:https://ccg.ibs.re.kr/event/2026-11-09-13/
LOCATION:IBS Science Culture Center\, Daejeon\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
END:VEVENT
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