English

Ideal Triangulations and Once-Punctured Surface Bundles

Geometric Topology 2025-06-09 v2

Abstract

A well-known result of Walsh states that if T\mathcal T^* is an ideal triangulation of an atoroidal, acylindrical, irreducible, compact 3-manifold with torus boundary components, then every properly embedded, two-sided, incompressible surface SS is isotopic to a spun-normal surface unless SS is isotopic to a fiber or virtual fiber. Previously it was unknown if for such a 3-manifold an ideal triangulation in which a fiber spun-normalizes exists. We give a proof of existence and give an algorithm to construct the ideal triangulation provided the 3-manifold has a single boundary component.

Keywords

Cite

@article{arxiv.2505.21798,
  title  = {Ideal Triangulations and Once-Punctured Surface Bundles},
  author = {Birch Bryant},
  journal= {arXiv preprint arXiv:2505.21798},
  year   = {2025}
}

Comments

v2 fixed typographic and orthographic errors. Improved clarity of prose throughout. Added Question 5.7 concerning virtual fibers. Included new figure of crushing map: Figure 2. Included additional acknowledgement of genesis and funding

R2 v1 2026-07-01T02:44:45.870Z