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.
|Journal||Physics Letters, Section A: General, Atomic and Solid State Physics|
|Publication status||Published - 2021 Jun 4|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)