Fractional Integrable and Related Discrete Nonlinear Schr\"odinger Equations

TL;DR

This paper introduces the first integrable fractional discrete nonlinear Schrödinger equation, analyzes its soliton solutions, and compares it with a related non-integrable fractional equation, advancing understanding of fractional nonlinear wave dynamics.

Contribution

It presents the first discrete fractional integrable nonlinear Schrödinger equation and analyzes its soliton solutions, expanding the scope of fractional integrable systems.

Findings

Derived the first fractional integrable discrete nonlinear Schrödinger equation.

Found special soliton solutions with complex peak velocity behavior.

Compared solutions with a related fractional averaged discrete NLS, showing similar behavior for small amplitudes.

Abstract

Integrable fractional equations such as the fractional Korteweg-deVries and nonlinear Schr\"odinger equations are key to the intersection of nonlinear dynamics and fractional calculus. In this manuscript, the first discrete/differential difference equation of this type is found, the fractional integrable discrete nonlinear Schr\"odinger equation. This equation is linearized; special soliton solutions are found whose peak velocities exhibit more complicated behavior than other previously obtained fractional integrable equations. This equation is compared with the closely related fractional averaged discrete nonlinear Schr\"odinger equation which has simpler structure than the integrable case. For positive fractional parameter and small amplitude waves, the soliton solutions of the integrable and averaged equations have similar behavior.