Virtually Haken surgeries on once-punctured torus bundles

Details Virtually Haken surgeries on once-punctured torus bundles Virtually Haken surgeries on once-punctured torus bundles

2005-06-22

arxiv.org/abs/math/0506443v3

Mathematics

Geometric Topology

Much expanded. Added applications of the method described in v. 2. Showed that many punctured torus bundles have the property

Scientific paper

We describe a class $\mathcal{C}$ of punctured torus bundles such that, for each $M \in \mathcal{C}$, all but finitely many Dehn fillings on $M$ are virtually Haken. We show that $\mathcal{C}$ contains infinitely many commensurability classes, and we give evidence that $\mathcal{C}$ includes representatives of ``most'' commensurability classes of punctured torus bundles. In particular, we define an integer-valued complexity function on monodromies $f$ (essentially the length of the LR-factorization of $f_*$ in $PSL_2(\mathbb{Z})$), and use a computer to show that if the monodromy of $M$ has complexity at most 5, then $M$ is finitely covered by an element of $\mathcal{C}$. If the monodromy has complexity at most 12, then, with at most 36 exceptions, $M$ is finitely covered by an element of $\mathcal{C}$. We also give a method for computing ``algebraic boundary slopes'' in certain finite covers of punctured torus bundles.

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