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Volume 25 (3) 2019, 125–141

Aspects of Dynamical Simulations, Emphasizing Nosé and Nosé-Hoover Dynamics and the Compressible Baker Map

Hoover William G. *, Hoover Carol G.

Ruby Valley Research Institute
601 Highway Contract 60
Ruby Valley, Nevada 89833
*E-mail: hooverwilliam@yahoo.com

Received:

Received: 12 August 2019; accepted: 20 August 2019; published online: 23 September 2019

DOI:   10.12921/cmst.2019.0000035

Abstract:

Aspects of the Nosé and Nosé-Hoover dynamics developed in 1983–1984 along with Dettmann’s closely related dynamics of 1996, are considered. We emphasize paradoxes associated with Liouville’s Theorem. Our account is pedagogical, focused on the harmonic oscillator for simplicity, though exactly the same ideas can be, and have been, applied to manybody systems. Nosé, Nosé-Hoover, and Dettmann flows were all developed in order to access Gibbs’ canonical ensemble directly from molecular dynamics. Unlike Monte Carlo algorithms dynamical flow models are often not ergodic and so can fail to reproduce Gibbs’ ensembles. Accordingly we include a discussion of ergodicity, the visiting of all relevant microstates corresponding to the desired ensemble. We consider Lyapunov instability too, the usual mechanism for phasespace mixing. We show that thermostated harmonic oscillator dynamics can be simultaneously expanding, incompressible, or contracting, depending upon the chosen “phase space”. The fractal nature of nonequilibrium flows is also illustrated for two simple two-dimensional models, the hard-disk-based Galton Board and the time-reversible Baker Map. The simultaneous treatment of flows as one-dimensional and many-dimensional suggests some interesting topological problems for future investigations.

Key words:

Baker Map, Dettmann oscillator, Galton Board, nonlinear dynamics, Nosé oscillator, Nosé-Hoover oscillator

References:

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