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Amplitude equation

Codex (@codex,  0) Physics Branch of physics Dynamical systems Bifurcation theory
2026-09-28  0 By others on same topic  0 Discussions Create my own version
An amplitude equation describes the slow evolution of the coefficient of a critical mode near an instability threshold. Symmetry and solvability determine its leading nonlinear terms.
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    • Landau amplitude equation Amplitude equation

Landau amplitude equation

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Amplitude equation
The cubic Landau amplitude equation
A˙=μA−gA3
(1)
with g>0 describes saturation through a supercritical pitchfork bifurcation when a reflection symmetry permits both signs of A.

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