Lines of minima and Teichmuller geodesics

Details Lines of minima and Teichmuller geodesics Lines of minima and Teichmuller geodesics

2006-05-04

arxiv.org/abs/math/0605135v2

Mathematics

Geometric Topology

58 pages, includes appendix and 9 figures; v2: corrections and revised exposition; to appear in Geometric and Functional Analy

Scientific paper

For two measured laminations $\nu^+$ and $\nu^-$ that fill up a hyperbolizable surface $S$ and for $t \in (-\infty, \infty)$, let $L_t$ be the unique hyperbolic surface that minimizes the length function $e^t l(\nu^+) + e^{-t} l(\nu^-)$ on Teichmuller space. We characterize the curves that are short in $L_t$ and estimate their lengths. We find that the short curves coincide with the curves that are short in the surface $G_t$ on the Teichmuller geodesic whose horizontal and vertical foliations are respectively, $e^t \nu^+$ and $e^{-t} \nu^-$. By deriving additional information about the twists of $\nu^+$ and $\nu^-$ around the short curves, we estimate the Teichmuller distance between $L_t$ and $G_t$. We deduce that this distance can be arbitrarily large, but that if $S$ is a once-punctured torus or four-times-punctured sphere, the distance is bounded independently of $t$.

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