A new two-component sasa-satuma equation: large-time asymaptotics on the line

Xiaodan Zhao, Lei Wang
Nonlinear Sciences, Exactly Solvable and Integrable Systems, Exactly Solvable and Integrable Systems (nlin.SI), Mathematical Physics (math-ph)
2023-09-27 16:00:00
We consider the initial value problem for a new two-component Sasa-Satsuma equation associated with the fourth-order Lax pair with decaying initial data on the line. By utilizing the spectral analysis, the solution of the new two-component Sasa-Satsuma system is transformed into the solution of a fourth-order matrix Riemann-Hilbert problem. Then the long-time asymptotics of the solution is obtained by means of the nonlinear steepest descent method of Deift and Zhou for oscillatory Riemann-Hilbert problems. We show that there are three main regions in the half-plane, where the asymptotics has qualitatively different forms: a left fast decaying sector, a central Painleve sector where the asymptotics is described in terms of the solution of a new coupled Painleve II equation which is related to a fourth-order matrix Riemann-Hilbert problem, and a right slowly decaying oscillatory sector.
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