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Multi-center vector field methods for wave equations. (English) Zbl 1413.58012

Summary: We develop the method of vector-fields to further study dispersive wave equations. Radial vector fields are used to get a-priori estimates such as the Morawetz estimate on solutions of dispersive wave equations. A key to such estimates is the repulsiveness or nontrapping conditions on the flow corresponding to the wave equation. Thus this method is limited to potential perturbations which are repulsive, that is the radial derivative pointing away from the origin. In this work, we generalize this method to include potentials which are repulsive relative to a line in space (in three or higher dimensions), among other cases. This method is based on constructing multi-centered vector fields as multipliers, cancellation lemmas and energy localization.

MSC:

58J45 Hyperbolic equations on manifolds
35B40 Asymptotic behavior of solutions to PDEs
35J10 Schrödinger operator, Schrödinger equation
35L70 Second-order nonlinear hyperbolic equations
35Q41 Time-dependent Schrödinger equations and Dirac equations
35Q55 NLS equations (nonlinear Schrödinger equations)
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