Abstract
We consider billiards obtained by removing three strictly convex obstacles satisfying the non-eclipse condition on the plane. The restriction of the dynamics to the set of non-escaping orbits is conjugated to a subshift on three symbols that provides a natural labeling of all periodic orbits. We study the following inverse problem: does the Marked Length Spectrum (i.e., the set of lengths of periodic orbits together with their labeling), determine the geometry of the billiard table? We show that from the Marked Length Spectrum it is possible to recover the curvature at periodic points of period two, as well as the Lyapunov exponent of each periodic orbit.
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Notes
For brevity, in most of the exposition we restrict ourselves to the case \(m=3\), yet, all of the results apply to arbitrary \(m\ge 3\).
Recall that for \(x=(s,\varphi )\in \mathcal {M}\) and \(x'=(s',\varphi '):=\mathcal {F}(s,\varphi )\), we have \(\det D_{x}\mathcal {F}=\frac{\cos \varphi }{\cos \varphi '}\). Thus, for any periodic orbit \((x_1,x_2,\dots ,x_p)\) of period \(p \ge 2\), we have \(\det D_{x_j}\mathcal {F}^p=1\), for \(j \in \{1,\dots ,p\}\).
As we will see more in detail later, the right hand side of each of the following estimates is negative, because periodic orbits are minimizers of the length functional.
Even for \(p=3\) we have 7 vs 2 free parameters!
Note that the p-length of a dispersing wavefront is uniformly bounded by the length of its trace on the scatterer.
See Footnote 6.
Due to the palindromic symmetry, as in Lemma 3.2, the angle at this point has to vanish.
i.e., such that \(\sigma _{j}\ne \sigma _{j+1}\) for \(j\in \{1,\dots ,p-1\}\) and such that \(\sigma _1 \ne \sigma _p\).
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Acknowledgements
The authors wish to thank the hospitality of the ETH Institute for Theoretical Studies Zürich and the support of Dr. Max Rssler, the Walter Haefner Foundation and the ETH Zurich Foundation, as well as the Banff International Research Station – where part of this work was carried over. The authors are also indebted to the anonymous referees, to L. Stoyanov and M. Zworski for their most useful comments and suggestions. M.L. is grateful to L. Backes, A. Brown, S. Crovisier, F. Rodriguez-Hertz, D. Obata, A. Wilkinson and D. Xu for useful conversations during visits at the Pennsylvania State University, the University of Chicago, and the Université Paris-Sud.
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P.B. is supported in part by Hungarian National Foundation for Scientific Research (NKFIH OTKA) Grants K104745 and K123782. J.D.S. and M.L. are supported by the NSERC Discovery Grant, reference number 502617-2017. V.K. acknowledges partial support of the NSF Grant DMS-1402164.
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Bálint, P., De Simoi, J., Kaloshin, V. et al. Marked Length Spectrum, Homoclinic Orbits and the Geometry of Open Dispersing Billiards. Commun. Math. Phys. 374, 1531–1575 (2020). https://doi.org/10.1007/s00220-019-03448-x
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DOI: https://doi.org/10.1007/s00220-019-03448-x