Abstract
For real-analytic expanding open dynamical systems in arbitrary finite dimension, we establish rigorous explicit bounds on the eigenvalues of the corresponding transfer operators acting on spaces of holomorphic functions. In dimension 1 the eigenvalue decay rate is exponentially fast, while in dimension d it is \(O{(\theta }^{{n}^{1/d} })\) as n → ∞ for some 0 < θ < 1.
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- 1.
When acting on these spaces, \(\mathcal{P}_{H}\) has a strictly positive spectral radius δ, with δ > 0 an eigenvalue such that − logδ is the corresponding escape rate (see, e.g. [14] for one-dimensional maps); thus escape is at an exponential rate, rather than anything faster. Moreover, \({\delta }^{-n}\mathcal{P}_{H}^{n}1 \rightarrow \varrho\), where \(\varrho\) is the density function for the Pianigiani-Yorke measure [15].
- 2.
The study of transfer operators on this space U(D) was inaugurated by Ruelle [18].
- 3.
Ruelle [18], following Grothendieck [11], stated the asymptotics were O(θ n) as n → ∞, independent of the dimension d, though Fried [10] corrected this to \(O{(\theta }^{{n}^{1/d} })\). One novelty of our results, relative to Fried and Ruelle, is that the constant θ, as well as the implicit constant in the big-O asymptotics, is rendered explicit.
- 4.
- 5.
As always, we are making the standing assumption that D is an admissible domain, i.e. that the closure of \(\cup _{i\in \mathcal{J}}T_{i}(D)\) lies in D.
- 6.
If D has C 2 boundary, then H 2(D) can be identified with the \({L}^{2}(\partial D,\sigma )\)-closure of U(D), where σ denotes (2d − 1)-dimensional Lebesgue measure on the boundary \(\partial D\), normalised so that σ(∂ D) = 1. The inner product in H 2(D) is given (see [13, Chaps. 1.5 and 8]) by \((f,g) =\int _{\partial D}{f}^{{\ast}}\,\overline{{g}^{{\ast}}}\,d\sigma\), where, for h ∈ H 2(D), the symbol h ∗ denotes the corresponding nontangential limit function in L 2(∂ D, σ).
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Bandtlow, O.F., Jenkinson, O. (2014). Eigenvalues of Transfer Operators for Dynamical Systems with 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_2
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DOI: https://doi.org/10.1007/978-1-4939-0419-8_2
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