＜＜＜「@」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 -----------------------------------------------