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Estimating the fractal dimension of sets determined by nonergodic parameters
University of California Irvine, Department of Mathematics, 440V Rowland Hall, Irvine, CA 92697-3875, USA |
Given fixed and irrational $0<α, θ<1$, consider the billiard table $B_{α}$ formed by a $\frac{1}{2}×1$ rectangle with a horizontal barrier of length $α$ emanating from the midpoint of a vertical side and a billiard flow with trajectory angle $θ$. In 1969, Veech introduced two subsets $K_{0}(θ)$ and $K_{1}(θ)$ of $\mathbb{R}/\mathbb{Z}$ that are defined in terms of the continued fraction representation of $θ∈\mathbb{R}/\mathbb{Z}$, and Veech showed that these sets have Hausdorff dimension $0$ when $θ$ is rational. Moreover, the set $K_{1}(θ)$ describes the set of all $α$ such that the billiard flow on $B_{α}$ in direction $θ$ is nonergodic. We show that the Hausdorff dimension of the sets $K_{0}(θ)$ and $K_{1}(θ)$ can attain any value in $[0, 1]$ by considering the continued fraction expansion of $θ$. This result resolves an analogue of work completed by Cheung, Hubert, and Pascal in which they consider, for fixed $α$, the set of $θ$ such that the flow on $B_{α}$ in direction $θ$ is nonergodic.
References:
[1] |
Y. Cheung,
Hausdorff dimension of the set of points on divergent trajectories of a homogeneous flow on a product space, Ergod. Th. Dynam. Sys., 27 (2007), 65-85.
doi: 10.1017/S0143385706000678. |
[2] |
Y. Cheung,
Hausdorff dimension of the set of singular pairs, Annals of Mathematics, 173 (2011), 127-167.
doi: 10.4007/annals.2011.173.1.4. |
[3] |
Y. Cheung and A. Eskin, Slow divergence and unique ergodicity, Fields Institute Communications, 51 (2007), 213-222. Google Scholar |
[4] |
Y. Cheung, P. Hubert and H. Masur,
Dichotomy for the Hausdorff dimension of the set of nonergodic directions, Inventiones, 183 (2001), 337-383.
doi: 10.1007/s00222-010-0279-2. |
[5] |
K. Falconer,
Fractal Geometry: Mathematical Foundations and Applications, John Wiley and Sons, Chichester, 1990. |
[6] |
H. Masur and S. Tabachnikov,
Rational billiards and flat surfaces, Handbook of Dynamical Systems, 1A (2002), 1015-1089.
doi: 10.1016/S1874-575X(02)80015-7. |
[7] |
L. Narins, Oral communication, 2013. Google Scholar |
[8] |
W. Veech,
Strict ergodicity in zero dimensional dynamical systems and the Kronecker-Weyl theorem modulo 2, Trans. Amer. Math. Soc., 140 (1969), 1-33.
doi: 10.2307/1995120. |
show all references
References:
[1] |
Y. Cheung,
Hausdorff dimension of the set of points on divergent trajectories of a homogeneous flow on a product space, Ergod. Th. Dynam. Sys., 27 (2007), 65-85.
doi: 10.1017/S0143385706000678. |
[2] |
Y. Cheung,
Hausdorff dimension of the set of singular pairs, Annals of Mathematics, 173 (2011), 127-167.
doi: 10.4007/annals.2011.173.1.4. |
[3] |
Y. Cheung and A. Eskin, Slow divergence and unique ergodicity, Fields Institute Communications, 51 (2007), 213-222. Google Scholar |
[4] |
Y. Cheung, P. Hubert and H. Masur,
Dichotomy for the Hausdorff dimension of the set of nonergodic directions, Inventiones, 183 (2001), 337-383.
doi: 10.1007/s00222-010-0279-2. |
[5] |
K. Falconer,
Fractal Geometry: Mathematical Foundations and Applications, John Wiley and Sons, Chichester, 1990. |
[6] |
H. Masur and S. Tabachnikov,
Rational billiards and flat surfaces, Handbook of Dynamical Systems, 1A (2002), 1015-1089.
doi: 10.1016/S1874-575X(02)80015-7. |
[7] |
L. Narins, Oral communication, 2013. Google Scholar |
[8] |
W. Veech,
Strict ergodicity in zero dimensional dynamical systems and the Kronecker-Weyl theorem modulo 2, Trans. Amer. Math. Soc., 140 (1969), 1-33.
doi: 10.2307/1995120. |

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