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On the non‐realizability of braid groups by diffeomorphisms

On the non‐realizability of braid groups by diffeomorphisms For every compact surface S of finite type (possibly with boundary components but without punctures), we show that when n is sufficiently large there is no lift σ of the surface braid group Bn(S) to Diff(S,n), the group of diffeomorphisms preserving n marked points and restricting to the identity on the boundary. Our methods are applied to give a new proof of Morita's non‐lifting theorem in the best possible range. These techniques extend to the more general setting of spaces of codimension‐2 embeddings, and we obtain corresponding results for spherical motion groups, including the string motion group. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the London Mathematical Society Wiley

On the non‐realizability of braid groups by diffeomorphisms

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References (27)

Publisher
Wiley
Copyright
© London Mathematical Society
ISSN
0024-6093
eISSN
1469-2120
DOI
10.1112/blms/bdw016
Publisher site
See Article on Publisher Site

Abstract

For every compact surface S of finite type (possibly with boundary components but without punctures), we show that when n is sufficiently large there is no lift σ of the surface braid group Bn(S) to Diff(S,n), the group of diffeomorphisms preserving n marked points and restricting to the identity on the boundary. Our methods are applied to give a new proof of Morita's non‐lifting theorem in the best possible range. These techniques extend to the more general setting of spaces of codimension‐2 embeddings, and we obtain corresponding results for spherical motion groups, including the string motion group.

Journal

Bulletin of the London Mathematical SocietyWiley

Published: Jun 1, 2016

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