On the validity of the conjugate pairing rule for Lyapunov exponents

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · Journal of Statistical Physics

DOI:https://doi.org/10.1023/A:1023040621826· OSTI ID:669862

Bonetto, F; Cohen, E G.D. ^[1]; Pugh, C ^[2]

---

1. Rockefeller Univ., New York, NY (United States)
2. Univ. of California, Berkeley, CA (United States). Mathematics Dept.

For Hamiltonian systems subject to an external potential which in the presence of a thermostat will reach a nonequilibrium stationary state Dettmann and Morriss proved a strong conjugate pairing rule (SCPR) for pairs of Lyapunov exponents in the case of isokinetic (IK) stationary states which have a given kinetic energy. This SCPR holds for all initial phases of the system, all times t, and all numbers of particles N. This proof was generalized by Wojtkowski and Liverani to include hard interparticle potentials. A geometrical reformulation of those results is presented. The present paper proves numerically, using periodic orbits for the Lorentz gas, that SCPR cannot hold for isoenergetic (IE) stationary states which have a given total internal energy. In that case strong evidence is obtained for CPR to hold for large N and t, where it can be conjectured that the larger N, the smaller t will be. This suffices for statistical mechanics.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER13847
• OSTI ID: 669862
• Journal Information: Journal of Statistical Physics, Journal Name: Journal of Statistical Physics Journal Issue: 3-4 Vol. 92; ISSN JSTPBS; ISSN 0022-4715
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DYNAMICS
HAMILTONIANS
LORENTZ GAS
LYAPUNOV METHOD
NUMERICAL SOLUTION
STATISTICAL MECHANICS
SYMMETRY