Quasifibrations in configuration Lie groupoids and orbifold braid groups
Abstract
In [19] we studied a Fadell-Neuwirth type fibration theorem for orbifolds, and gave a short exact sequence of fundamental groups of configuration Lie groupoids of Lie groupoids corresponding to the genus zero 2-dimensional orbifolds with cone points, and at least one puncture. In this paper we extend this work to all genus , 2-dimensional orbifolds with cone points. As a consequence, we prove the Farrell-Jones Isomorphism conjecture for the fundamental groups of the associated configuration Lie groupoids. This answers a substantial part of a question we posed in [[18], Problem]. In [19] we also showed that for all global quotient type orbifolds, the fibration theorem does not hold. Here, we give some nontrivial examples of orbifolds where a Fadell-Neuwirth type quasifibration theorem holds. Finally, we state an Asphericity conjecture and a Quasifibration conjecture for orbifolds.
Cite
@article{arxiv.2106.08110,
title = {Quasifibrations in configuration Lie groupoids and orbifold braid groups},
author = {S. K. Roushon},
journal= {arXiv preprint arXiv:2106.08110},
year = {2023}
}
Comments
This paper is withdrawn. Referee pointed out an error in the proof of Theorem 2.2 (injective part of the exact sequence). The paper is being revised and improved, and will be posted in two articles soon