Summary
By deriving Pohojaev-type identities we prove that nonelliptic nonlinear Schrödinger equations do not admit localized travelling wave solutions. Similary, we prove that the Davey-Stewartson hyperbolic-elliptic systems do not support travelling wave solutions except for a specific range of the parameters that comprises the DS II focusing case (where the existence of lumps is well known).
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Communicated by Thanasis Fokas
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Ghidaglia, J.M., Saut, J.C. Nonexistence of travelling wave solutions to nonelliptic nonlinear schrödinger equations. J Nonlinear Sci 6, 139–145 (1996). https://doi.org/10.1007/BF02434051
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DOI: https://doi.org/10.1007/BF02434051