Sharp ill-posedness and well-posedness results for the KdV-Burgers equation: the real line case

Type: Article

Publication Date: 2011-10-05

Citations: 18

DOI: https://doi.org/10.2422/2036-2145.2011.3.02

Abstract

We complete the known results on the Cauchy problem in Sobolev spaces for the KdV-Burgers equation by proving that this equation is well-posed in H -1 (R) with a solution-map that is analytic fromwhereas it is ill-posed in H s (R), as soon as s < -1, in the sense that the flowmap u 0 → u(t) cannot be continuous from H s (R) to even D (R) at any fixed t > 0 small enough.As far as we know, this is the first result of this type for a dispersive-dissipative equation.The framework we develop here should be useful to prove similar results for other dispersive-dissipative models.

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