The H-theorem for the entropy of waves

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In a previous study I defined the nonequilibrium entropy of classical waves in terms of the density matrix of the wave amplitude (the square root of the wave action density). In the present work, I derive the H-theorem for this entropy for weak nonlinear waves whose equations of motion are written in a symplectic form. This formulation enables us to define the Helmholtz free energy of waves in classical plasmas.

Original languageEnglish
Article number127315
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Publication statusPublished - 2021 Jun 4

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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