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Interpolating Dispersionless Integrable System
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We introduce a dispersionless integrable system which interpolates between the dispersionless Kadomtsev-Petviashvili equation and the hyper-CR equation. The interpolating system arises as a symmetry reduction of the anti--self--dual Einstein equations in (2, 2) signature by a conformal Killing vector whose self--dual derivative is null. It also arises as a special case of the Manakov-Santini integrable system. We discuss the corresponding Einstein--Weyl structures.
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Arithmetic selection rules in dispersionless Hamiltonian systems
Liouville integrability conditions for monomial charge densities reduce to a negative Pell equation, generating an infinite set of commuting conserved charges for a new dispersionless Hamiltonian model.
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