Simplicity and Finiteness of Discrete Spectrum of the Benjamin-Ono Scattering Operator
Abstract
A spectral analysis is done on the L operator of the Lax pair for the Benjamin-Ono equation. Simplicity and finiteness of the discrete spectrum are established as are needed for the Fokas and Ablowitz inverse scattering transform scheme. A crucial step in the simplicity proof is the discovery of a new identity connecting the L2 norm of the eigenvector to its inner product with the scattering potential. The proof for finiteness is an extension of the ideas involved in the Birman-Schwinger bound for Schr\"odinger operators.
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