1. Boundaries of Disk-Like Self-affine Tiles
- Author
-
King Shun Leung and Jun Jason Luo
- Subjects
Contact matrix ,Spectral radius ,General Topology (math.GN) ,Metric Geometry (math.MG) ,Geometric Topology (math.GT) ,Omega ,Graph ,Theoretical Computer Science ,Combinatorics ,Mathematics - Geometric Topology ,Mathematics - Metric Geometry ,Computational Theory and Mathematics ,52C20, 11K55, 28A80 ,Hausdorff dimension ,FOS: Mathematics ,Discrete Mathematics and Combinatorics ,Geometry and Topology ,Affine transformation ,Cubic function ,Mathematics - General Topology ,Characteristic polynomial ,Mathematics - Abstract
Let $T:= T(A, {\mathcal D})$ be a disk-like self-affine tile generated by an integral expanding matrix $A$ and a consecutive collinear digit set ${\mathcal D}$, and let $f(x)=x^{2}+px+q$ be the characteristic polynomial of $A$. In the paper, we identify the boundary $\partial T$ with a sofic system by constructing a neighbor graph and derive equivalent conditions for the pair $(A,{\mathcal D})$ to be a number system. Moreover, by using the graph-directed construction and a device of pseudo-norm $\omega$, we find the generalized Hausdorff dimension $\dim_H^{\omega} (\partial T)=2\log \rho(M)/\log |q|$ where $\rho(M)$ is the spectral radius of certain contact matrix $M$. Especially, when $A$ is a similarity, we obtain the standard Hausdorff dimension $\dim_H (\partial T)=2\log \rho/\log |q|$ where $\rho$ is the largest positive zero of the cubic polynomial $x^{3}-(|p|-1)x^{2}-(|q|-|p|)x-|q|$, which is simpler than the known result., Comment: 26 pages, 11 figures
- Published
- 2013