Lyapunov instability and finite size effects in a system with long-range forces

Details Lyapunov instability and finite size effects in a system with long-range forces Lyapunov instability and finite size effects in a system with long-range forces

1997-07-30

arxiv.org/abs/chao-dyn/9707024v2

Phys.Rev.Lett. 80 (1998) 692-695

Physics

Condensed Matter

5 pages, Revtex, 3 figures included. Both text and figures have been changed. New Version accepted for publication in Physical

Scientific paper

10.1103/PhysRevLett.80.692

We study the largest Lyapunov exponent $\lambda$ and the finite size effects of a system of N fully-coupled classical particles, which shows a second order phase transition. Slightly below the critical energy density $U_c$, $\lambda$ shows a peak which persists for very large N-values (N=20000). We show, both numerically and analytically, that chaoticity is strongly related to kinetic energy fluctuations. In the limit of small energy, $\lambda$ goes to zero with a N-independent power law: $\lambda \sim \sqrt{U}$. In the continuum limit the system is integrable in the whole high temperature phase. More precisely, the behavior $\lambda \sim N^{-1/3}$ is found numerically for $U > U_c$ and justified on the basis of a random matrix approximation.

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