Collapsing to Alexandrov spaces with isolated mild singularities
Differential Geometry
2023-01-18 v2 Metric Geometry
Abstract
Let be a sequence of Riemannian manifolds with sectional curvature bound below collapsing to a compact Alexandrov space of dimension . Suppose that all but finitely many points of are -strained and that the space of directions at each exceptional point contains directions making obtuse angles with each other. We prove that admits a structure of locally trivial fibration over for sufficiently large . The same is true for collapsing sequences of Alexandrov spaces such that the infimum of the volume of the spaces of directions is sufficiently large relative to .
Cite
@article{arxiv.2108.11030,
title = {Collapsing to Alexandrov spaces with isolated mild singularities},
author = {Tadashi Fujioka},
journal= {arXiv preprint arXiv:2108.11030},
year = {2023}
}
Comments
Added a simple proof of Theorem 1.1