視聴に際しての注意事項
このページに含まれる映像は自由に視聴することができますが、許可無くコピー・配布などの行為を禁止します。
日時: 2010年10月29日(金) 16:30〜17:30
会場: 東京大学 大学院数理科学研究科 002号室
Robin Graham 氏 (University of Washington)
Ambient metrics and exceptional holonomy
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.