### Abstract

The implicit solution of the geometric optics equations (i.e. the modulation equations arising from the WKB Ansatz) of the defocusing nonlinear Schrödinger (NLS) equation is known to be expressible in terms of the classical hodograph transform. In this note, the solution procedure for the 2 × 2 system of quasilinear modulation equations is implemented, analogous to the implicit solution of the inviscid Burgers' equation, for smooth monotone initial data consistent with the modulation Ansatz. The implicit system is solved exactly using a classical method of Riemann. The relevant Riemann-Green functions can be found explicitly, hence allowing the exact location and time of shock formation to be calculated. The entire evolution of the exact solution can be observed through the shock formation.

Original language | English (US) |
---|---|

Pages (from-to) | 170-174 |

Number of pages | 5 |

Journal | Physics Letters A |

Volume | 257 |

Issue number | 3-4 |

State | Published - Jun 28 1999 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Physics Letters A*,

*257*(3-4), 170-174.

**On the exact solution of the geometric optics approximation of the defocusing nonlinear Schrödinger equation.** / Wright, Otis C.; Forest, M. Gregory; Mclaughlin, Kenneth D T.

Research output: Contribution to journal › Article

*Physics Letters A*, vol. 257, no. 3-4, pp. 170-174.

}

TY - JOUR

T1 - On the exact solution of the geometric optics approximation of the defocusing nonlinear Schrödinger equation

AU - Wright, Otis C.

AU - Forest, M. Gregory

AU - Mclaughlin, Kenneth D T

PY - 1999/6/28

Y1 - 1999/6/28

N2 - The implicit solution of the geometric optics equations (i.e. the modulation equations arising from the WKB Ansatz) of the defocusing nonlinear Schrödinger (NLS) equation is known to be expressible in terms of the classical hodograph transform. In this note, the solution procedure for the 2 × 2 system of quasilinear modulation equations is implemented, analogous to the implicit solution of the inviscid Burgers' equation, for smooth monotone initial data consistent with the modulation Ansatz. The implicit system is solved exactly using a classical method of Riemann. The relevant Riemann-Green functions can be found explicitly, hence allowing the exact location and time of shock formation to be calculated. The entire evolution of the exact solution can be observed through the shock formation.

AB - The implicit solution of the geometric optics equations (i.e. the modulation equations arising from the WKB Ansatz) of the defocusing nonlinear Schrödinger (NLS) equation is known to be expressible in terms of the classical hodograph transform. In this note, the solution procedure for the 2 × 2 system of quasilinear modulation equations is implemented, analogous to the implicit solution of the inviscid Burgers' equation, for smooth monotone initial data consistent with the modulation Ansatz. The implicit system is solved exactly using a classical method of Riemann. The relevant Riemann-Green functions can be found explicitly, hence allowing the exact location and time of shock formation to be calculated. The entire evolution of the exact solution can be observed through the shock formation.

UR - http://www.scopus.com/inward/record.url?scp=0347876136&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0347876136&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0347876136

VL - 257

SP - 170

EP - 174

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

SN - 0375-9601

IS - 3-4

ER -