The Inelastic Maxwell Model

Details The Inelastic Maxwell Model The Inelastic Maxwell Model

2003-01-14

arxiv.org/abs/cond-mat/0301238v1

Lecture Notes in Physics 624, 65 (2003)

Physics

Condensed Matter

Statistical Mechanics

28 pages, 2 figures, review

Scientific paper

10.1007/b12449

Dynamics of inelastic gases are studied within the framework of random collision processes. The corresponding Boltzmann equation with uniform collision rates is solved analytically for gases, impurities, and mixtures. Generally, the energy dissipation leads to a significant departure from the elastic case. Specifically, the velocity distributions have overpopulated high energy tails and different velocity components are correlated. In the freely cooling case, the velocity distribution develops an algebraic high-energy tail, with an exponent that depends sensitively on the dimension and the degree of dissipation. Moments of the velocity distribution exhibit multiscaling asymptotic behavior, and the autocorrelation function decays algebraically with time. In the forced case, the steady state velocity distribution decays exponentially at large velocities. An impurity immersed in a uniform inelastic gas may or may not mimic the behavior of the background, and the departure from the background behavior is characterized by a series of phase transitions.

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