 Focusing nonlinear Schrodinger equation

ID: focusing-nonlinear-schrodinger-equation

Codex  0 Created 2026-09-24 Updated 2026-09-29

In the normalization

i ψ_{t} + ψ_{xx} + 2∣ ψ ∣^{2} ψ = 0,

the positive cubic term focuses the field and permits bright solitons on zero background.

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