Correspondence conjecture between horizontal Goodman surgery and veering triangulations

A veering triangulation Δ\Delta on an oriented 33-manifold NN determines a transitive pseudo-Anosov flow ϕt(Δ,M)\phi^t(\Delta,M) on a closed oriented 33-manifold MM, and a transitive pseudo-Anosov flow ϕt\phi^t on a closed oriented 33-manifold MM determines a veering triangulation Δ(ϕt,C)\Delta(\phi^t,\mathcal C) after removing a collection of closed orbits C\mathcal C. A horizontal surgery curve is a curve satisfying the relevant horizontal-surgery conditions for the corresponding flow or triangulation. Correspondence conjecture. For every veering triangulation Δ\Delta on NN, every horizontal surgery curve cc for Δ\Delta is isotopic to one for ϕt(Δ,M)\phi^t(\Delta,M), and

ϕt(Δ1n(c),M1n(c)) is orbit equivalent to ϕt(Δ,M)1n(c).\phi^t\left(\Delta_{\frac{1}{n}}(c),M_{\frac{1}{n}}(c)\right)\text{ is orbit equivalent to }\phi^t(\Delta,M)_{\frac{1}{n}}(c).

Conversely, for every transitive pseudo-Anosov flow ϕt\phi^t and a suitable collection C\mathcal C of closed orbits, every horizontal surgery curve cc for ϕt\phi^t is isotopic to one for Δ(ϕt,C)\Delta(\phi^t,\mathcal C), and

Δ(ϕ1nt(c),C) is isomorphic to Δ(ϕt,C)1n(c).\Delta\left(\phi^t_{\frac{1}{n}}(c),\mathcal C\right)\text{ is isomorphic to }\Delta(\phi^t,\mathcal C)_{\frac{1}{n}}(c).

Here nn has the appropriate sign for the horizontal surgery. The conjecture would identify the dynamical and combinatorial surgery operations exactly, strengthening the correspondence between veering triangulations and pseudo-Anosov flows; the source does not state that any part of this formulation is proved.

Sources & referencesView supporting material

Primary source

Chi Cheuk Tsang, “Horizontal Goodman surgery and almost equivalence of pseudo-Anosov flows”, arXiv:2401.01847 (2024).

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