The Euler classes of taut foliations on graph manifolds

@misc{xie2026euler,
  title = {{The Euler classes of taut foliations on graph manifolds}},
  author = {Yaoping Xie},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.39875},
  eprint = {2609.39875},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.39875},
}

TY  - UNPB
TI  - The Euler classes of taut foliations on graph manifolds
AU  - Yaoping Xie
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.39875
UR  - https://arxiv.org/abs/2609.39875
AB  - In this paper, we determine the set of Euler classes of all taut foliations for a family of closed graph manifolds. As a consequence, for any closed aspherical graph manifold Y, every integral class in the closed dual Thurston unit ball can be virtually realized as the Euler class of some taut foliation. In particular, Y virtually admits a taut foliation with vanishing Euler class. We present examples of graph manifolds with arbitrarily large first Betti number, which admit no taut foliations with vanishing real Euler classes. This shows that the virtual requirement is necessary. We also provide examples of graph manifolds with arbitrarily large first Betti number, for which every taut foliation has vanishing real Euler class, but none has vanishing integral Euler class. This illustrates the subtle difference between real Euler class zero and integral Euler class zero.
ER  -