Efficient geodesics in the curve complex and their dot graphs

Abstract

For the complex of curves of a closed orientable surface of genus $g$, $\mathcal{C}(S_{g>1})$, the notion of efficient geodesic in was introduced in arXiv:1408.4133. There it was established that there always exists (finitely many) efficient geodesics between any two vertices, $ v_α , v_β \in \mathcal{C}(S_g)$, representing homotopy classes of simple closed curves, $α, β\subset S_g$. The main tool for used in establishing the existence of efficient geodesic was a dot graph, a booking scheme for recording the intersection pattern of a reference arc, $γ\subset S_g$, with the simple closed curves associated with the vertices of geodesic path in the zero skeleton, $\mathcal{C}^0(S_g)$. In particular, for an efficient geodesic between $v_α$ and $v_β$ of length $d \geq 3$, it was shown that any curve corresponding to the vertex that is distance one from $v_α$ intersects any $γ$ at most $d -2$ times. In this note we make a more expansive study of the characterizing "shape" of the dot graphs over the entire set of vertices in an efficient geodesic edge-path. The key take away of this study is that the shape of a dot graph for any efficient geodesic is contained within a spindle shape region. Since the Nielson-Thurston coordinates of any curve on $S_g$ are directly derived from its intersection number with finitely many reference arcs, spindle shaped dot graphs control the coordinate behavior of curves associated with the vertices of an efficient geodesic.