On a Class of Spatial Discretizations of Equations of the Nonlinear Schrodinger Type

Details On a Class of Spatial Discretizations of Equations of the Nonlinear Schrodinger Type On a Class of Spatial Discretizations of Equations of the Nonlinear Schrodinger Type

2006-03-23

arxiv.org/abs/nlin/0603046v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

Submitted for publication in a journal on October 14, 2005

Scientific paper

We demonstrate the systematic derivation of a class of discretizations of nonlinear Schr{\"o}dinger (NLS) equations for general polynomial nonlinearity whose stationary solutions can be found from a reduced two-point algebraic condition. We then focus on the cubic problem and illustrate how our class of models compares with the well-known discretizations such as the standard discrete NLS equation, or the integrable variant thereof. We also discuss the conservation laws of the derived generalizations of the cubic case, such as the lattice momentum or mass and the connection with their corresponding continuum siblings.

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