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A Riemann–Hilbert Approach for the Novikov Equation
Symmetry, integrability and geometry: methods and applications, Tome 12 (2016) Cet article a éte moissonné depuis la source Math-Net.Ru

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We develop the inverse scattering transform method for the Novikov equation $u_t-u_{txx}+4u^2u_x=3u u_xu_{xx}+u^2u_{xxx}$ considered on the line $x\in(-\infty,\infty)$ in the case of non-zero constant background. The approach is based on the analysis of an associated Riemann–Hilbert (RH) problem, which in this case is a $3\times 3$ matrix problem. The structure of this RH problem shares many common features with the case of the Degasperis–Procesi (DP) equation having quadratic nonlinear terms (see [Boutet de Monvel A., Shepelsky D., Nonlinearity 26 (2013), 2081–2107, arXiv:1107.5995]) and thus the Novikov equation can be viewed as a “modified DP equation”, in analogy with the relationship between the Korteweg–de Vries (KdV) equation and the modified Korteweg–de Vries (mKdV) equation. We present parametric formulas giving the solution of the Cauchy problem for the Novikov equation in terms of the solution of the RH problem and discuss the possibilities to use the developed formalism for further studying of the Novikov equation.
Keywords: Novikov equation; Degasperis–Procesi equation; Camassa–Holm equation; inverse scattering transform; Riemann–Hilbert problem. 
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     author = {Anne Boutet de Monvel and Dmitry Shepelsky and Lech Zielinski},
     title = {A {Riemann{\textendash}Hilbert} {Approach} for the {Novikov} {Equation}},
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     year = {2016},
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     url = {http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a94/}
}
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Anne Boutet de Monvel; Dmitry Shepelsky; Lech Zielinski. A Riemann–Hilbert Approach for the Novikov Equation. Symmetry, integrability and geometry: methods and applications, Tome 12 (2016). http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a94/

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