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Kinetic Theory Estimates for the Kolmogorov-Sinai Entropy, and\ud the Largest Lyapunov Exponents for Dilute, Hard-Ball Gases and\ud for Dilute, Random Lorentz Gases

By H. van Beijeren, R. van Zon and J.R. Dorfman


The kinetic theory of gases provides methods for calculating Lyapunov exponents\ud and other quantities, such as Kolmogorov-Sinai entropies, that characterize\ud the chaotic behavior of hard-ball gases. Here we illustrate the use of\ud these methods for calculating the Kolmogorov-Sinai entropy, and the largest\ud positive Lyapunov exponent, for dilute hard-ball gases in equilibrium. The\ud calculation of the largest Lyapunov exponent makes interesting connections\ud with the theory of propagation of hydrodynamic fronts. Calculations are also\ud presented for the Lyapunov spectrum of dilute, random Lorentz gases in two\ud and three dimensions, which are considerably simpler than the corresponding\ud calculations for hard-ball gases. The article concludes with a brief discussion\ud of some interesting open problems

Topics: Natuur- en Sterrenkunde
Publisher: Springer
Year: 2000
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