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Mathematics > Differential Geometry
Title: Positive Scalar Curvature on Spin Pseudomanifolds: the Fundamental Group and Secondary Invariants
(Submitted on 6 May 2020 (v1), last revised 24 Jun 2021 (this version, v2))
Abstract: In this paper we continue the study of positive scalar curvature (psc) metrics on a depth-1 Thom-Mather stratified space $M_\Sigma$ with singular stratum $\beta M$ (a closed manifold of positive codimension) and associated link equal to $L$, a smooth compact manifold. We briefly call such spaces manifolds with $L$-fibered singularities. Under suitable spin assumptions we give necessary index-theoretic conditions for the existence of wedge metrics of positive scalar curvature. Assuming in addition that $L$ is a simply connected homogeneous space of positive scalar curvature, $L=G/H$, with the semisimple compact Lie group $G$ acting transitively on $L$ by isometries, we investigate when these necessary conditions are also sufficient. Our main result is that our conditions are indeed sufficient for large classes of examples, even when $M_\Sigma$ and $\beta M$ are not simply connected. We also investigate the space of such psc metrics and show that it often splits into many cobordism classes.
Submission history
From: Jonathan Rosenberg [view email][v1] Wed, 6 May 2020 11:29:36 GMT (41kb)
[v2] Thu, 24 Jun 2021 12:50:12 GMT (50kb,D)
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