The Lyapunov spectrum of the many-dimensional dilute random Lorentz gas

Details The Lyapunov spectrum of the many-dimensional dilute random Lorentz gas The Lyapunov spectrum of the many-dimensional dilute random Lorentz gas

2004-04-16

arxiv.org/abs/nlin/0404034v1

Nonlinear Sciences

Chaotic Dynamics

8 pages, revtex, 6 figures, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.70.036209

For a better understanding of the chaotic behavior of systems of many moving particles it is useful to look at other systems with many degrees of freedom. An interesting example is the high-dimensional Lorentz gas, which, just like a system of moving hard spheres, may be interpreted as a dynamical system consisting of a point particle in a high-dimensional phase space, moving among fixed scatterers. In this paper, we calculate the full spectrum of Lyapunov exponents for the dilute random Lorentz gas in an arbitrary number of dimensions. We find that the spectrum becomes flatter with increasing dimensionality. Furthermore, for fixed collision frequency the separation between the largest Lyapunov exponent and the second largest one increases logarithmically with dimensionality, whereas the separations between Lyapunov exponents of given indices not involving the largest one, go to fixed limits.

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