Hamiltonian reformulation and pairing of Lyapunov exponents for Nose-Hoover dynamics

Abstract

The Nose Hamiltonian is adapted, leading to a derivation of the Nose-Hoover equations of motion which does not involve time transformations, and in which the degree of freedom corresponding to the external reservoir is treated on the same footing as those of the rest of the system. In this form it is possible to prove the conjugate pairing rule for Lyapunov exponents of this system.

revtex, 4 pages, no figures, to appear in Phys. Rev. E

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