Isometry groups with radical, and aspherical Riemannian manifolds with large symmetry, I

Baues, Oliver¹ ; Kamishima, Yoshinobu²

¹ Department of Mathematics, University of Fribourg, Fribourg, Switzerland
² Department of Mathematics, Josai University, Sakado, Japan

Geometry & topology, Tome 27 (2023) no. 1, pp. 1-50

Résumé

Every compact aspherical Riemannian manifold admits a canonical series of orbibundle structures with infrasolv fibers, which is called its infrasolv tower. The tower arises from the solvable radicals of isometry group actions on the universal covers. Its length and the geometry of its base measure the degree of continuous symmetry of an aspherical Riemannian manifold. We say that the manifold has large local symmetry if it admits a tower of orbibundle fibrations with locally homogeneous fibers whose base is a locally homogeneous space. We construct examples of aspherical manifolds with large local symmetry which do not support any locally homogeneous Riemannian metrics.

Détail

DOI : 10.2140/gt.2023.27.1

Classification : 53C12, 53C30, 57S30
Keywords: aspherical manifolds, divisible manifolds, infrasolv tower, solvable radical, large symmetry, proper group actions, infrasolv manifolds, locally homogeneous manifolds, smooth toral actions

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