Thurston norm and Euler classes of tight contact structures
File(s)
Author(s)
Sivek, Steven
Yazdi, Mehdi
Type
Journal Article
Abstract
Bill Thurston proved that taut foliations of hyperbolic 3-manifolds have Euler
classes of norm at most one, and conjectured that any integral second cohomology class of
norm equal to one is realised as the Euler class of some taut foliation. Recent work of the
second author, joint with David Gabai, has produced counterexamples to this conjecture.
Since tight contact structures exist whenever taut foliations do and their Euler classes also
have norm at most one, it is natural to ask whether the Euler class one conjecture might
still be true for tight contact structures. In this short note, we show that the previously
constructed counterexamples for Euler classes of taut foliations in [Yaz20] are in fact realised
as Euler classes of tight contact structures. This provides some evidence for the Euler class
one conjecture for tight contact structures.
classes of norm at most one, and conjectured that any integral second cohomology class of
norm equal to one is realised as the Euler class of some taut foliation. Recent work of the
second author, joint with David Gabai, has produced counterexamples to this conjecture.
Since tight contact structures exist whenever taut foliations do and their Euler classes also
have norm at most one, it is natural to ask whether the Euler class one conjecture might
still be true for tight contact structures. In this short note, we show that the previously
constructed counterexamples for Euler classes of taut foliations in [Yaz20] are in fact realised
as Euler classes of tight contact structures. This provides some evidence for the Euler class
one conjecture for tight contact structures.
Date Issued
2023
Date Acceptance
2023-07-15
Citation
Bulletin of the London Mathematical Society, 2023, 55 (6), pp.2976-2990
ISSN
0024-6093
Publisher
Wiley
Start Page
2976
End Page
2990
Journal / Book Title
Bulletin of the London Mathematical Society
Volume
55
Issue
6
Copyright Statement
© 2023 The Authors. Bulletin of the London Mathematical Society is copyright © London Mathematical Society. This is an open access article
under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided
the original work is properly cited.
under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided
the original work is properly cited.
License URL
Publication Status
Published
Date Publish Online
2023-08-15