On the Validity of the Conjugate Pairing Rule for Lyapunov Exponents

Details On the Validity of the Conjugate Pairing Rule for Lyapunov Exponents On the Validity of the Conjugate Pairing Rule for Lyapunov Exponents

1998-03-09

arxiv.org/abs/chao-dyn/9803011v1

Nonlinear Sciences

Chaotic Dynamics

30 pages, 33 ps figure

Scientific paper

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 Wojtkovski 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.

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