Advances in Differential Equations

Existence and Stability of a Two-Parameter Family of Solitary Waves for an NLS-KdV System

John Albert and Santosh Bhattarai

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We prove existence and stability results for a two-parameter family of solitary-wave solutions to a system in which an equation of nonlinear Schr\"odinger type is coupled to an equation of Korteweg--de Vries type. Such systems model interactions between short and long dispersive waves. The results extend earlier results of Angulo, Albert and Angulo, and Chen. Our proof involves the characterization of solitary-wave solutions as minimizers of an energy functional subject to two constraints. To establish the precompactness of minimizing sequences via concentrated compactness, we establish the sub-additivity of the problem with respect to both constraint variables jointly.

Article information

Adv. Differential Equations, Volume 18, Number 11/12 (2013), 1129-1164.

First available in Project Euclid: 4 September 2013

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Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 35Q53: KdV-like equations (Korteweg-de Vries) [See also 37K10] 35Q55: NLS-like equations (nonlinear Schrödinger) [See also 37K10] 35B35: Stability 5A15 76B25: Solitary waves [See also 35C11]


Albert, John; Bhattarai, Santosh. Existence and Stability of a Two-Parameter Family of Solitary Waves for an NLS-KdV System. Adv. Differential Equations 18 (2013), no. 11/12, 1129--1164.

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