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[PEM17-01] Irreversibility of Landau damping
Keywords:Landau damping, Plasma waves, Collisionless plasma
The plasma echo is, however, not reversible if we interpret the word "reversible" by its literal meaning, which is "the time reversal process actually takes place in the real world." There will never be a process in which the echo occurs first and then the system returns to its initial state. Landau damping is a time irreversible process when we view it from the point of view that tries to derive macroscopic irreversibility from reversible basic equations in statistical physics. In this point of view plasma echo can occur after the wave damped out because the dissipation takes place in velocity space in the same time scale as in real space. This interpretation can be generalized to phenomena incollisionless plasmas, and we can say they are essentially irreversible in the same sense as in ordinary dissipative matters.