Abstract
In this paper we show that the flow map of the Benjamin-Ono equation on the line is weakly continuous in L 2(ℝ), using “local smoothing” estimates. L 2(ℝ) is believed to be a borderline space for the local well-posedness theory of this equation. In the periodic case, Molinet (Math. Ann. 337, 353–383, 2007) has recently proved that the flow map of the Benjamin-Ono equation is not weakly continuous in \(L^{2}(\mathbb{T})\). Our results are in line with previous work on the cubic nonlinear Schrödinger equation, where Goubet and Molinet (Nonlinear Anal. 71, 317–320, 2009) showed weak continuity in L 2(ℝ) and Molinet (Am. J. Math. 130, 635–683, 2008) showed lack of weak continuity in \(L^{2}(\mathbb{T})\).
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Cui, S., Kenig, C.E. Weak Continuity of the Flow Map for the Benjamin-Ono Equation on the Line. J Fourier Anal Appl 16, 1021–1052 (2010). https://doi.org/10.1007/s00041-010-9137-2
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DOI: https://doi.org/10.1007/s00041-010-9137-2