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- W1490428336 abstract "Given a strictly convex domain $Omega$ in $R^2$, there is a natural way to define a billiard map in it: a rectilinear path hitting the boundary reflects so that the angle of reflection is equal to the angle of incidence. In this paper we answer a relatively old question of Guillemin. We show that if two billiard maps are $C^{1,alpha}$-conjugate near the boundary, for some $alpha > 1/2$, then the corresponding domains are similar, i.e. they can be obtained one from the other by a rescaling and an isometry. As an application, we prove a conditional version of Birkhoff conjecture on the integrability of planar billiards and show that the original conjecture is equivalent to what we call an Extension problem. Quite interestingly, our result and a positive solution to this extension problem would provide an answer to a closely related question in spectral theory: if the marked length spectra of two domains are the same, is it true that they are isometric?" @default.
- W1490428336 created "2016-06-24" @default.
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- W1490428336 date "2012-03-06" @default.
- W1490428336 modified "2023-09-27" @default.
- W1490428336 title "On conjugacy of convex billiards" @default.
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