＜＜＜「@」を「__AT__」に置き換えています＞＞＞ Date: Mon, 25 May 2026 02:26:28 +0900 To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp, mugenml__AT__ml.rikkyo.ac.jp Subject: [Sg-l:10378] 多弦数理物理学セミナー (5月28日(木)15時半、住山元基さん) From: Masashi Hamanaka (Sg-l 経由)MLのみなさま こんにちは。今週木曜日(5/28)に名大多元数理で行われる対面セミナーの情報をお知らせいたします。 セミナー開始時間が15時から15時半に変更されておりますのでご注意ください。 スライドは英語、講演は日本語の予定です。オンライン配信はございません。 なお同じ日の14時からAidan McSharryさん(ケンブリッジ)の臨時セミナーがございます。(詳しくは最下部をご参照ください) みなさまのご参加をお待ちいたします。 はま中 ---------------------------------------------- Date: ☆3:30pm☆ (JST), 28th(Thu) May. 2026 Place: Room 328, Sci. Bldg A, Nagoya University https://www.math.nagoya-u.ac.jp/ja/direction/campus.html Speaker: Sumiyama, Genkiさん (Kitasato U.) Title : The Topology of Yang--Mills Instantons on Periodic Space Reconsidered Websites: https://www.math.nagoya-u.ac.jp/~hamanaka/seminar.html ----------------------------------------------- -------------------------------------------------------------------------------- Speaker:Aidan McSharry(University of Cambridge) Date/time:28th May 2026, 14:00-15:00 Place: Sci.Bldg. A207, Nagoya U. Title: On the third law of black hole mechanics for supersymmetric black holes. Abstract: Recently it has been shown that the third law of black hole mechanics can be violated: an exactly extremal Reissner-Nordström black hole can form in finite time in gravitational collapse of matter with a large charge to mass ratio. However, it has also been proved that this cannot happen if the matter satisfies a “supersymmetric” lower bound on its energy in terms of its charge. In this talk, I will discuss these developments, as well as extensions of this latter proof to supersymmetric black holes with a negative cosmological constant and for such black holes (with non-positive cosmological constant) not formed in collapse. The proofs of these results rely on ideas related to quasi-local energy and proofs of the positive energy theorems: these shall be discussed, and the main theorem given as a rigidity result associated with the interior of a “supersymmetric surface” – a concept to be introduced. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Date: Mon, 3 Aug 2026 04:20:22 +0900 To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp, mugenml__AT__ml.rikkyo.ac.jp, geometry-ml__AT__math.nagoya-u.ac.jp Subject: [Sg-l:10552] 多弦数理物理学セミナー (8月6日(木)14時45分＆8月7日(金)13時半、酒谷雄峰さん) From: Masashi Hamanaka (Sg-l 経由) MLのみなさま こんにちは。今週木曜日(8/6)・金曜日(8/7)に名大多元数理で行われる対面セミナーの情報をお知らせいたします。90分3コマです。 言語は英語の予定です。オンライン配信はございません。 みなさまのご参加をお待ちいたします。 はま中 ---------------------------------------------- Date: 14:45 (JST) 6th(Thu) & 13:30 7th(Fri) August 2026 Place: Room 207, Sci. Bldg A, Nagoya University https://www.math.nagoya-u.ac.jp/ja/direction/campus.html Speaker: Sakatani, Yuhoさん (Kyoto Prefectural University of Medicine) Title : Extended geometry, generalized duality, and consistent truncations of supergravity Abstract: In this talk, I will review recent developments in doubled geometry, which was introduced based on T-duality in string theory, and its extension, exceptional geometry. I will first introduce the basic ideas of T-duality and doubled geometry, and then present a duality called generalized T-duality, which arises from considering a doubled version of a Lie group. I will further generalize these ideas to U-duality and exceptional geometry. Next, based on the mega-space approach (similar to Cartan geometry), I will define curvature and torsion tensors in doubled/exceptional geometry. Using these results, I will introduce a new class of spaces called generalized cosets and explain how they can be used to construct consistent truncations of supergravity. I will also discuss generalized duality arising from this construction, together with several concrete examples. Websites: https://www.math.nagoya-u.ac.jp/~hamanaka/seminar.html https://www.math.nagoya-u.ac.jp/en/research/calendar/data/1785332817-20.html ----------------------------------------------- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Date: Tue, 27 Oct 2026 03:59:42 +0900 To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp, mugenml__AT__ml.rikkyo.ac.jp, geometry-ml__AT__math.nagoya-u.ac.jp Subject: [Sg-l:10736] 多弦数理物理学セミナー (10月30日(金)16時半、Tristan McLoughlinさん) From: Masashi Hamanaka (Sg-l 経由) MLのみなさま こんにちは。今週金曜日(10/30)に名大多元数理で行われるオンラインセミナーの情報をお知らせいたします。 ASDYMソリトンに関する大きな進展です。論文はこちらです：https://arxiv.org/abs/2610.27074 みなさまのご参加をお待ちいたします。 はま中 ---------------------------------------------- Date: 16:30 (JST) 30th (Fri) October 2026 Speaker: Tristan McLoughlinさん (Trinity College, Dublin) Title : Soliton Scattering in anti-self-dual Yang-Mills theory Abstract: In this talk we will consider extended solitons in split-signature anti-self-dual Yang-Mills theory. We will discuss the construction of solutions describing walls meeting at trivalent junctions to form four-dimensional foam-like structures. We will sketch some of their properties including colour-dressed phase shifts for wall interactions and non-trivial lump interactions that occur in collinear kinematic limits. We will outline how the determinant of the soliton matrix provides a useful tau-function for characterizing these solutions. Place: Online (Zoom) https://us02web.zoom.us/j/83442939373?pwd=JnBqGVfWGX5S7v7aqiKR0NV8cQjEuw.1 Websites: https://www.math.nagoya-u.ac.jp/~hamanaka/seminar.html ----------------------------------------------- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Date: Wed, 4 Nov 2026 02:13:19 +0900 To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp, mugenml__AT__ml.rikkyo.ac.jp, geometry-ml__AT__math.nagoya-u.ac.jp Subject: [Sg-l:10761] 多弦数理物理学セミナー (11月6日(金)16時半、菅野浩明さん) From: Masashi Hamanaka (Sg-l 経由) MLのみなさま こんにちは。今週金曜日(11/6)に名大多元数理で行われる対面セミナーの情報をお知らせいたします。 オンライン配信はございません。 みなさまのご参加をお待ちいたします。 はま中 ---------------------------------------------- Date: 16:30 (JST) 6th(Fri) November 2026 Place: Room 207, Sci. Bldg A, Nagoya University https://www.math.nagoya-u.ac.jp/ja/direction/campus.html Speaker: Kanno, Hiroakiさん (Nagoya University) Title : Framed bipartite graphs and the wall crossing of the perverse coherent sheaves on the blow-up Abstract: We consider the moduli space of perverse coherent sheaves on the blow-up of the projective plane P^2. King, Nakajima and Yoshioka introduced a quiver description of the moduli space, where the region \zeta_0 <0, \zeta_0 + \zeta_1 <0 in the space of the stability parameters is decomposed into the chambers C^{(m)} separated by the walls W_m : m \zeta_0 + (m+1) \zeta_1 =0, m=0,1,2,… There are two distinguished chambers, the zero chamber C^{(0)} and the “\infty” chamber C^{(m)} m >> 1. In the zero chamber the fixed points of the torus action are labeled by the super partitions. On the other hand, in the “\infty” chamber the quiver gives the moduli space of torsion free sheaves on the blow-up. We propose that in the intermediate chambers C^{(m)}, the fixed points are labeled by bipartite graphs with appropriate structure, which is motivated by the computation of the partition function by Jeffrey-Kirwan residue. Website: https://www.math.nagoya-u.ac.jp/~hamanaka/seminar.html -----------------------------------------------