Ngoc Cuong Nguyen (KAIST)
Visitors
Ngoc Cuong Nguyen Visitor (2025.3.1-2026.2.15) from KAIST Office: B248
12 events found.
Events
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Workshop on Hyperkähler Varieties and Related Topics
B109 IBS, Korea, Republic ofConferences and WorkshopsInvited Speakers (three one-hour lectures) Ekaterina Amerik (HSE U.) Yoonjoo Kim (Columbia U.) Zhiyuan Li (SCMS, Fudan U.) Keiji Oguiso (U. Tokyo) Abstracts PDF file Schedule March 10 (Monday) 14:00-15:00 Registration 15:00-16:00 Amerik, Lecture I 16:00-16:30 Coffee Break 16:30-17:30 Li, Lecture I 18:00-20:00 Speakers dinner March 11 (Tuesday) 11:00-12:00 Amerik, Lecture II 12:00-14:00 Lunch 14:00-15:00 …
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Lorenzo Barban, General results on C*-actions on projective varieties
B236-1 IBS, Korea, Republic ofComplex Geometry SeminarSpeaker Lorenzo Barban IBS CCG In this lecture series we aim to describe the rich relation between C*-actions on complex normal projetive varieties and the birational maps among the associated geometric quotients. We will begin this first seminar by explaining a motivating example, called the Atiyah flop. We will then discuss general results …
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Lorenzo Barban, Geometric Invariant Theory for C*-actions
B236-1 IBS, Korea, Republic ofComplex Geometry SeminarSpeaker Lorenzo Barban IBS CCG In this second talk, which is the technical core of the lecture series, we describe several tools to study C*-actions on projective varieties, such as the bandwidth, the AMvsFM Lemma, and the pruning of a variety. With this, we will be able to describe the -birational geometry of …
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Lorenzo Barban, Geometric realization of birational maps among Mori dream spaces
B236-1 IBS, Korea, Republic ofComplex Geometry SeminarSpeaker Lorenzo Barban IBS CCG Given a birational map ϕ among normal projective varieties, a geometric realization of ϕ is a normal projective C*-variety such that the birational map among geometric quotients parametrizing general orbits coincides with ϕ. Geometric realizations can be thought of as a projective algebraic version of the notion of …
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Mihai Paun (Universität Bayreuth)
VisitorsMihai Paun Visitor (2025.3.26-2025.5.2) from Universität Bayreuth Office: B249
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Mihai Paun, Positivity of quotients of holomorphic tensor fields (Lecture I)
B236-1 IBS, Korea, Republic ofSeveral Complex Variables SeminarSpeaker Mihai Paun U. Bayreuth I will present the main results and techniques in the preprint arxiv:2502.02183 (joint with J. Cao). This was motivated by the recent preprint by W. Ou, cf. arXiv:2501.1808 (especially by the algebraicity criteria for foliations on compact Kähler manifolds in this article). The first lecture is dedicated to …
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Mihai Paun, Positivity of quotients of holomorphic tensor fields (Lecture II)
B236-1 IBS, Korea, Republic ofSeveral Complex Variables SeminarSpeaker Mihai Paun U. Bayreuth I will present the main results and techniques in the preprint arxiv:2502.02183 (joint with J. Cao). This was motivated by the recent preprint by W. Ou, cf. arXiv:2501.1808 (especially by the algebraicity criteria for foliations on compact Kähler manifolds in this article). The first lecture is dedicated to …
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Thibaut Delcroix, Weighted Kähler geometry and semisimple principal fibrations (Lecture I)
B236-1 IBS, Korea, Republic ofAlgebraic Geometry SeminarSpeaker Thibaut Delcroix Université de Montpellier In Kähler geometry, especially in the questions of existence of canonical Kähler metrics, the volume form ωn associated with a Kähler form ω plays a central role. In weighted Kähler geometry, we consider a Kähler manifold X equipped with a Hamiltonian action of a torus T, a …
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Mihai Paun, Hermitian-Einstein metrics for stable coherent sheaves and Bogomolov-Gieseker inequality(Lecture III)
B236-1 IBS, Korea, Republic ofSeveral Complex Variables SeminarSpeaker Mihai Paun U. Bayreuth I will survey the main results obtained in the articles arXiv:2501.18088 and arXiv:2405.10003. There will be no "serious" proofs, I will nevertheless try to highlight the main ingredients in our arguments.
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Jinhyung Park, Effective gonality theorem on weight-one syzygies of algebraic curves
B236-1 IBS, Korea, Republic ofAlgebraic Geometry SeminarSpeaker Jinhyung Park KAIST In 1986, Green-Lazarsfeld raised the gonality conjecture asserting that the gonality gon(C) of a smooth projective curve C of genus g can be read off from weight-one syzygies of a sufficiently positive line bundle L, and also proposed possible least degree of L, that is 2g+gon(C)-1. In 2015, Ein-Lazarsfeld …
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Thibaut Delcroix, Weighted Kähler geometry and semisimple principal fibrations (Lecture II)
B236-1 IBS, Korea, Republic ofAlgebraic Geometry SeminarSpeaker Thibaut Delcroix Université de Montpellier In Kähler geometry, especially in the questions of existence of canonical Kähler metrics, the volume form ωn associated with a Kähler form ω plays a central role. In weighted Kähler geometry, we consider a Kähler manifold X equipped with a Hamiltonian action of a torus T, a …