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On the integrability of the Benjamin-Ono equation on the torus

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arxiv 1905.01849 v2 pith:4NKYGE4X submitted 2019-05-06 math.AP

On the integrability of the Benjamin-Ono equation on the torus

classification math.AP
keywords equationbenjamin--onocoordinatesbenjamin-onotorusadmitsallowalmost
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In this paper we prove that the Benjamin-Ono equation, when considered on the torus, is an integrable (pseudo)differential equation in the strongest possible sense: it admits global Birkhoff coordinates on the space $L^2(\T)$. These are coordinates which allow to integrate it by quadrature and hence are also referred to as nonlinear Fourier coefficients. As a consequence, all the $L^2(\T)$ solutions of the Benjamin--Ono equation are almost periodic functions of the time variable. The construction of such coordinates relies on the spectral study of the Lax operator in the Lax pair formulation of the Benjamin--Ono equation and on the use of a generating functional, which encodes the entire Benjamin--Ono hierarchy.

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