談話会・数理科学講演会

過去の記録 ~03/28次回の予定今後の予定 03/29~

担当者 阿部紀行、岩木耕平、河澄響矢(委員長)、小池祐太
セミナーURL https://www.ms.u-tokyo.ac.jp/seminar/colloquium/index.html

2010年10月29日(金)

16:30-17:30   数理科学研究科棟(駒場) 002号室
*** 通常とは部屋が異なります。ご注意ください ***
お茶&Coffee&お菓子: 16:00~16:30 (コモンルーム)。

Robin Graham 氏 (University of Washington)
Ambient metrics and exceptional holonomy (ENGLISH)
[ 講演概要 ]
The holonomy of a pseudo-Riemannian metric is a subgroup of the orthogonal group which measures the structure preserved by parallel translation. Construction of pseudo-Riemannian metrics whose holonomy is an exceptional Lie group has been of great interest in recent years. This talk will outline a construction of metrics in dimension 7 whose holonomy is contained in the split real form of the exceptional group $G_2$. The datum for the construction is a generic real-analytic 2-plane field on a manifold of dimension 5; the metric in dimension 7 arises as the ambient metric of a conformal structure on the 5-manifold defined by Nurowski in terms of the 2-plane field.