BEGIN:VCALENDAR
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PRODID:-//Center for Complex Geometry - ECPv6.16.4.1//NONSGML v1.0//EN
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METHOD:PUBLISH
X-WR-CALNAME:Center for Complex Geometry
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:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260402T140000
DTEND;TZID=Asia/Seoul:20260402T150000
DTSTAMP:20260325T054838Z
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:20260325T054909Z
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:20260520T005133Z
CREATED:20260401T071547Z
LAST-MODIFIED:20260520T005133Z
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\nPDF file \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:20260512T204319Z
CREATED:20260407T060111Z
LAST-MODIFIED:20260512T204319Z
UID:4523-1779879600-1779883200@ccg.ibs.re.kr
SUMMARY:Morse-Bott functions from complex structures
DESCRIPTION:    Speaker\n\n\nHyunmoon Kim\nEwha Womans University\n\n\n\n\n\n\nWe present a quadratic Morse-Bott function on the real Grassmannian of a symplectic vector space from a compatible linear complex structure. Its stable manifolds generalize the Lagrangian\, symplectic\, isotropic\, and coisotropic Grassmannians to include the Grassmannians of linear subspaces that are neither isotropic\, coisotropic\, nor symplectic. The negative gradient flow deformation retracts these stable manifolds to compact homogeneous spaces for the unitary group.
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;TZID=Asia/Seoul:20260616T160000
DTEND;TZID=Asia/Seoul:20260616T170000
DTSTAMP:20260615T070009Z
CREATED:20260615T070009Z
LAST-MODIFIED:20260615T070009Z
UID:4590-1781625600-1781629200@ccg.ibs.re.kr
SUMMARY:Some geometric problems on G-varieties of complexity 1
DESCRIPTION:    Speaker\n\n\nYan Li\nBeijing Institute of Technology\n\n\n\n\n\n\nLet $G$ be a connected\, reductive\, linear algebraic group that acts on a normal variety $X$\, and $B$ be a Borel subgroup group of $G$. The complexity of the $G$-action on $X$ was defined by E. B. Vinberg in 1985 as the codimension of $B$-orbit at a sufficiently general position. $G$-varieties of complexity 0 are the well-known spherical varieties\, which have been widely studied by many authors in the past decades. $G$-varieties of complexity 1 also provides rich examples\, the basic theory on geometrical structure was founded by D. A. Timashev in 1997. \nIn the first lecture\, I will give an overview on the classification theory\, as well as some fundamental theorems on geometrical structure of $G$-varieties of complexity 1 which are mainly established by D. A. Timashev. In the second one\, I will introduce some recent works on geometrico-analysis problems on $G$-varieties of complexity 1\, such as K-stability and its weighted version. We will start from the former works of Suss\, Ilten\, Langlois\, Terpereau\, etc. until our recent ones.
URL:https://ccg.ibs.re.kr/event/some-geometric-problems-on-g-varieties-of-complexity-1/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260617T160000
DTEND;TZID=Asia/Seoul:20260617T170000
DTSTAMP:20260615T070110Z
CREATED:20260615T070110Z
LAST-MODIFIED:20260615T070110Z
UID:4593-1781712000-1781715600@ccg.ibs.re.kr
SUMMARY:Some geometric problems on G-varieties of complexity 1
DESCRIPTION:    Speaker\n\n\nYan Li\nBeijing Institute of Technology\n\n\n\n\n\n\nLet $G$ be a connected\, reductive\, linear algebraic group that acts on a normal variety $X$\, and $B$ be a Borel subgroup group of $G$. The complexity of the $G$-action on $X$ was defined by E. B. Vinberg in 1985 as the codimension of $B$-orbit at a sufficiently general position. $G$-varieties of complexity 0 are the well-known spherical varieties\, which have been widely studied by many authors in the past decades. $G$-varieties of complexity 1 also provides rich examples\, the basic theory on geometrical structure was founded by D. A. Timashev in 1997. \nIn the first lecture\, I will give an overview on the classification theory\, as well as some fundamental theorems on geometrical structure of $G$-varieties of complexity 1 which are mainly established by D. A. Timashev. In the second one\, I will introduce some recent works on geometrico-analysis problems on $G$-varieties of complexity 1\, such as K-stability and its weighted version. We will start from the former works of Suss\, Ilten\, Langlois\, Terpereau\, etc. until our recent ones.
URL:https://ccg.ibs.re.kr/event/some-geometric-problems-on-g-varieties-of-complexity-1-2/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260701T163000
DTEND;TZID=Asia/Seoul:20260701T173000
DTSTAMP:20260621T160131Z
CREATED:20260621T160131Z
LAST-MODIFIED:20260621T160131Z
UID:4601-1782923400-1782927000@ccg.ibs.re.kr
SUMMARY:Birational contractions of \(\overline{\mathrm{M}}_{g\,n}\) and their dependence on the characteristic
DESCRIPTION:    Speaker\n\n\nDaebeom Choi\nUniversity of Pennsylvania\n\n\n\n\n\n\nIn this talk\, we discuss the existence and nonexistence of certain birational contractions of \(\overline{\mathrm{M}}_{g\,n}\). Somewhat surprisingly\, this depends on the characteristic of the base field: many such contractions exist only in positive characteristic. We present a precise form of this phenomenon and discuss two examples that highlight the difference between characteristic zero and positive characteristic. The first is a simple and explicit contraction that exists only in positive characteristic\, and the second is a modular interpretation of the morphisms associated with psi classes on \(\overline{\mathrm{M}}_{1\,n}\). We also offer some speculation on why such characteristic-dependent phenomena arise.
URL:https://ccg.ibs.re.kr/event/birational-contractions-of-overlinemathrmm_gn-and-their-dependence-on-the-characteristic/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260709T163000
DTEND;TZID=Asia/Seoul:20260709T173000
DTSTAMP:20260609T062941Z
CREATED:20260609T062941Z
LAST-MODIFIED:20260609T062941Z
UID:4571-1783614600-1783618200@ccg.ibs.re.kr
SUMMARY:TBA
DESCRIPTION:    Speaker\n\n\nSung Gi Park\nPrinceton University\n\n\n\n\n\n\nTBA
URL:https://ccg.ibs.re.kr/event/tba-6/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20260710T100000
DTEND;TZID=Asia/Seoul:20260710T110000
DTSTAMP:20260621T155950Z
CREATED:20260609T063041Z
LAST-MODIFIED:20260621T155950Z
UID:4573-1783677600-1783681200@ccg.ibs.re.kr
SUMMARY:Hodge structure on the singular cohomology of singular cubic fourfolds
DESCRIPTION:    Speaker\n\n\nHyunsuk Kim\nUniversity of Michigan\n\n\n\n\n\n\nConsidering the singular cohomology of a cubic fourfold yields a morphism from the moduli space of (smooth) cubic fourfolds to the period domain. Both spaces have natural compactifications\, the GIT moduli space of cubic fourfolds parametrizing all GIT polystable objects\, and the Baily-Borel compactification of the period domain\, purely coming from group theory. This yields a birational map between two projective varieties. Laza and Looijenga independently gave a precise description of the birational geometry between these two spaces. Recently\, Sung Gi Park gave a systematic understanding on this picture using Hodge-Du Bois theory and higher singularities\, which have been developed by Friedman-Laza\, Mustata-Popa\, and many others. \nIn order to attack this question\, it is vital to understand the Hodge structure on the singular cohomology of a singular member in this moduli problem\, and also the Hodge theoretic properties of a degeneration to it. In a joint work with Kenny Ascher\, Jennifer Li\, Lisa Marquand\, Sung Gi Park\, and Sasha Viktorova\, we systematically carry out the calculation of the Hodge-Du Bois diamond of all GIT polystable cubic fourfolds using techniques coming from Saito’s Hodge modules.
URL:https://ccg.ibs.re.kr/event/tba-7/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261109
DTEND;VALUE=DATE:20261114
DTSTAMP:20260613T170852Z
CREATED:20260307T152404Z
LAST-MODIFIED:20260613T170852Z
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)\nAeryeong Seo (Kyungpook National U.)\nLaurent Stolovitch (U. Nice)\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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