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Cuenin, Jean-Claude (2020): Embedded eigenvalues of generalized Schrodinger operators. In: Journal of Spectral Theory, Vol. 10, No. 2: pp. 415-437

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We provide examples of operators T(D) + V in L-2(R-d) with decaying potentials that have embedded eigenvalues. The decay of the potential depends on the curvature of the (Fermi) surfaces of constant kinetic energy T. We make the connection to counterexamples in Fourier restriction theory.

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