Abstract
We study several classes of dispersing billiards with holes, including both finite and infinite horizon Lorentz gases and tables with corner points. We allow holes in the form of arcs in the boundary and open sets in the interior of the table as well as generalized holes in which escape may depend on the angle of collision as well as the position. For a large class of initial distributions (including Lebesgue measure and the smooth invariant (SRB) measure for the billiard before the introduction of the hole), we prove the existence of a common escape rate and a limiting conditionally invariant distribution. The limiting distribution converges to the SRB measure for the billiard as the hole tends to zero. Finally, we are able to characterize the common escape rate via pressure on the survivor set.
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Notes
- 1.
We give the definition for invertible T. When T is not invertible, define \({\mathring{M}}^{\infty } = \cap _{i=0}^{\infty }{T}^{-i}(M\setminus H)\).
- 2.
In the presence of cusps (corner points whose angle is zero), it was proved in [CM07, CZ08] that the billiard map has polynomial decay of correlations and so in general will have polynomial rates of escape. Thus the present methods will not apply.
- 3.
According to [23, Sect. 2.1], we could take \(m_{W}(N_{\varepsilon }(\partial H) \cap W) \leq C{_{0}\varepsilon }^{t_{0}}\) for any exponent t 0 > 0. We choose \(\varepsilon _{0} = 1/2\) here to simplify the exposition and choice of constants in the norms and because this already contains an interesting class of examples (see also (A3)(2) of Sect. 8.3.3).
- 4.
Here by \(\tilde{{\mathcal{C}}}^{1}({\mathcal{W}}^{s})\), we mean to indicate \(\tilde{{\mathcal{C}}}^{p}({\mathcal{W}}^{s})\) with p = 1, i.e., functions which are Lipschitz on elements of \({\mathcal{W}}^{s}\).
- 5.
Our treatment of stable curves here differs from that in [23]. In that abstract setting, stable curves are defined via graphs in charts of the given manifold. In the present more concrete setting, we dispense with charts and use the global \((r,\varphi )\) coordinates.
- 6.
Recall that a physical measure for T is an ergodic, invariant probability measure μ for which there exists a positive Lebesgue measure set B μ , with μ(B μ ) = 1, such that \(\lim _{n\rightarrow \infty }\frac{1} {n}\sum _{i=0}^{n-1}\psi ({T}^{i}x) =\mu (\psi )\) for all x ∈ B μ and all continuous functions ψ.
- 7.
Indeed, [11, Sect. 4.9] does not address the infinite horizon case explicitly, but a quick calculation shows that an exponent of 1∕3 is in fact needed.
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Acknowledgements
This research is partially supported by NSF grant DMS-1101572.
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Demers, M.F. (2014). Dispersing Billiards with Small Holes. In: Bahsoun, W., Bose, C., Froyland, G. (eds) Ergodic Theory, Open Dynamics, and Coherent Structures. Springer Proceedings in Mathematics & Statistics, vol 70. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0419-8_8
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