BEGIN:VCALENDAR
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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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X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20200101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211202T110000
DTEND;TZID=Asia/Seoul:20211202T120000
DTSTAMP:20260615T135815
CREATED:20211202T020000Z
LAST-MODIFIED:20211123T040520Z
UID:883-1638442800-1638446400@ccg.ibs.re.kr
SUMMARY:Sai-Kee Yeung\, Almost Complex Structures and Complex Structures on Manifolds of Even Dimension at Least 6
DESCRIPTION:     Speaker\n\n\nSai-Kee Yeung\nPurdue University\n\n\n\n\n\nWe would like to explain for each real even dimension 2n ≥ 6 some examples of compact differentiable manifolds supporting an almost complex structure which cannot be deformed to an integrable complex structure.
URL:https://ccg.ibs.re.kr/event/2021-12-02/
LOCATION:on-line
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20211209
DTEND;VALUE=DATE:20211210
DTSTAMP:20260615T135815
CREATED:20211208T150000Z
LAST-MODIFIED:20220124T011541Z
UID:831-1639008000-1639094399@ccg.ibs.re.kr
SUMMARY:Algebraic Geometry Day at CCG in IBS
DESCRIPTION:List of Seminars \n\n\n\n\n\nOn the Singular Loci of Higher Secants of Veronese Varieties\nKangjin Han (DGIST)\n14:00-14:50\, online \n\n\nManin’s Conjecture for a Log Del Pezzo Surface of Index 2\nDongSeon Hwang (Ajou Univ.)\n15:20-16:10\, IBS B266 \n\n\nUlrich Bundles on Cubic Fourfolds\nYeongrak Kim (Pusan National Univ.)\n16:30-17:20\, IBS B266
URL:https://ccg.ibs.re.kr/event/2021-12-09/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211209T140000
DTEND;TZID=Asia/Seoul:20211209T145000
DTSTAMP:20260615T135815
CREATED:20211209T050000Z
LAST-MODIFIED:20211207T022951Z
UID:824-1639058400-1639061400@ccg.ibs.re.kr
SUMMARY:Kangjin Han\, On the Singular Loci of Higher Secants of Veronese Varieties
DESCRIPTION:     Speaker\n\n\nKangjin Han\nDGIST\n\n\n\n\n\n\n(This is a part of Algebraic Geometry Day at CCG in IBS.) \nFor a projective variety X in PN\, the k-secant variety σk(X) is defined to be the closure of the union of k-planes in PN spanned by k-points of X. In this talk\, we consider singular loci of higher secant varieties of the image of the d-uple Veronese embedding of projective n-space\, νd(Pn). For the singular loci of k-secant of νd(Pn)\, it has been known only for k≤3. First\, I will review some basic notions and results and then explain projective techniques with respect to an explicit calculation of the Gauss map of X and computation for conormal space via a certain type of Young flattening. As investigating geometry of moving tangents along subvarieties\, we determine the (non-)singularity of so-called ‘subsecant loci’ of k-secant of νd(Pn) for arbitrary k. This is a joint work with Katsuhisa Furukawa.
URL:https://ccg.ibs.re.kr/event/2021-12-09-1400/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211209T152000
DTEND;TZID=Asia/Seoul:20211209T161000
DTSTAMP:20260615T135815
CREATED:20211209T062000Z
LAST-MODIFIED:20211122T013859Z
UID:826-1639063200-1639066200@ccg.ibs.re.kr
SUMMARY:DongSeon Hwang\, Manin’s Conjecture for a Log Del Pezzo Surface of Index 2
DESCRIPTION:     Speaker\n\n\nDongSeon Hwang\nAjou Univ.\n\n\n\n\n\n\n(This is a part of Algebraic Geometry Day at CCG in IBS.) \nManin’s conjecture predicts the asymptotic behavior on the number of rational points of bounded anticanonical height on Fano varieties. In this talk\, I will explain how the geometry governs the arithmetic in the case of a log del Pezzo surface with A4 and K5 singularities using the torsor method. This talk is based on joint work in progress with Ulrich Derenthal.
URL:https://ccg.ibs.re.kr/event/2021-12-09-1520/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211209T163000
DTEND;TZID=Asia/Seoul:20211209T172000
DTSTAMP:20260615T135815
CREATED:20211209T073000Z
LAST-MODIFIED:20211122T014017Z
UID:829-1639067400-1639070400@ccg.ibs.re.kr
SUMMARY:Yeongrak Kim\, Ulrich Bundles on Cubic Fourfolds
DESCRIPTION:     Speaker\n\n\nYeongrak Kim\nPusan National Univ.\n\n\n\n\n\n\n(This is a part of Algebraic Geometry Day at CCG in IBS.) \nUlrich bundles are geometric objects corresponding to maximally generated maximal Cohen-Macaulay modules\, whose existence has several interesting applications in commutative algebra\, homological algebra\, and linear algebra. After a pioneering work of Beauville and Eisenbud-Schreyer\, existence and classification of Ulrich bundles become important questions also in projective geometry. For instance\, they could help to understand the cone of cohomology tables of coherent sheaves on the underlying projective variety\, determinantal representations of hypersurfaces\, and determinantal representations of Cayley-Chow forms. In this talk\, I will discuss construction of Ulrich bundles on smooth cubic fourfolds. Unlike smooth cubic surfaces or threefolds\, the smallest possible rank of Ulrich bundles on a smooth cubic fourfold may vary if it is special\, i.e.\, X contains certain surfaces which are not homologous to complete intersections. On the other hand\, a (very) general cubic fourfold does not have an Ulrich bundle of rank <6. I will explain how to construct a rank 6 Ulrich bundle on an arbitrary smooth cubic fourfold. This is a joint work with Daniele Faenzi.
URL:https://ccg.ibs.re.kr/event/2021-12-09-1630/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211228T110000
DTEND;TZID=Asia/Seoul:20211228T120000
DTSTAMP:20260615T135815
CREATED:20211228T020000Z
LAST-MODIFIED:20211213T012857Z
UID:885-1640689200-1640692800@ccg.ibs.re.kr
SUMMARY:Olivier Martin\, Measures of Association for Algebraic Varieties
DESCRIPTION:     Speaker\n\n\nOlivier Martin\nStony Brook Univ.\n\n\n\n\n\n\nI will discuss recent work in collaboration with R. Lazarsfeld which explores the following question: Given varieties X and Y of the same dimension how far are they from being birational? I will define various “measures of association” which quantify the failure of X and Y to be birational and present partial results\, heuristics\, and several open problems. For instance\, given an n-fold Z dominating very general hypersurfaces X and Y in Pn+1 of degrees d\,e > 2n+1\, we show that the degrees of the projections Z—>X and Z—>Y are at least d and e. Moreover\, given very general hyperelliptic curves X and Y\, any hyperelliptic curve in XxY is contracted by the projection to X or the projection to Y.
URL:https://ccg.ibs.re.kr/event/2021-12-28/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20211228T160000
DTEND;TZID=Asia/Seoul:20211228T170000
DTSTAMP:20260615T135815
CREATED:20211228T070000Z
LAST-MODIFIED:20211228T111500Z
UID:919-1640707200-1640710800@ccg.ibs.re.kr
SUMMARY:Paul-Andi Nagy\, Einstein Deformations of Hyperkaehler Cones
DESCRIPTION:     Speaker\n\n\nPaul-Andi Nagy\nIBS CCG\n\n\n\n\n\nFor a hyperkaehler cone with compact link (M\, g) we describe the Einstein deformation theory of g and relate it to the algebraic geometry of the twistor space Z of M. This is joint work with Uwe Semmelmann.
URL:https://ccg.ibs.re.kr/event/2021-12-28-1600/
LOCATION:B236\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
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