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Ramification conjecture and Hirzebruch’s property of line arrangements

Part of: Topological manifolds Global differential geometry Distance geometry Special aspects of infinite or finite groups

Published online by Cambridge University Press:  25 October 2016

D. Panov  and
A. Petrunin
D. Panov
Affiliation:
Department of Mathematics, King’s College London, Strand, London, WC2R 2LS, UK email dmitri.panov@kcl.ac.uk
A. Petrunin
Affiliation:
Penn State University Mathematics Department, University Park, State College, PA 16802USA email petrunin@math.psu.edu
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Abstract

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The ramification of a polyhedral space is defined as the metric completion of the universal cover of its regular locus. We consider mainly polyhedral spaces of two origins: quotients of Euclidean space by a discrete group of isometries and polyhedral metrics on $\mathbb{C}\text{P}^{2}$ with singularities at a collection of complex lines. In the former case we conjecture that quotient spaces always have a $\text{CAT}[0]$ ramification and prove this in several cases. In the latter case we prove that the ramification is $\text{CAT}[0]$ if the metric on $\mathbb{C}\text{P}^{2}$ is non-negatively curved. We deduce that complex line arrangements in $\mathbb{C}\text{P}^{2}$ studied by Hirzebruch have aspherical complement.

Keywords

Alexandrov geometrypolyhedral spacesCAT[0] spaceshyperplane arrangements

MSC classification

Primary: 51K10: Synthetic differential geometry 53C23: Global geometric and topological methods (à la Gromov); differential geometric analysis on metric spaces 57N65: Algebraic topology of manifolds 20F36: Braid groups; Artin groups
Type
Research Article
Information
Compositio Mathematica , Volume 152 , Issue 12 , December 2016 , pp. 2443 - 2460
Copyright
© The Authors 2016 

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