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The Nosé-Poincaré method for constant temperature molecular dynamics. (English) Zbl 0933.81058
From the text: The authors present a new extended phase space method for constant temperature (canonical ensemble) molecular dynamics. Their starting point is the Hamiltonian introduced by S. Nosé to generate trajectories corresponding to configurations in the canonical ensemble. Using a Poincaré time-transformation, they construct a Hamiltonian system with the correct intrinsic time scale and show that it generates trajectories in the canonical ensemble. This approach corrects a serious deficiency of the standard change of variables (Nosé-Hoover dynamics), which yields a time-reversible system but simultaneously destroys the Hamiltonian structure. A symplectic discretization method is presented for solving the Nosé-Poincaré equations. The method is explicit and preserves the time-reversal symmetry. In numerical experiments, it is shown that the new method exhibits enhanced stability when the temperature fluctuation is large. In the appendix extensions are presented for Nosé chains, holonomic constraints, and rigid bodies.

81V55 Molecular physics
81S10 Geometry and quantization, symplectic methods
81-08 Computational methods for problems pertaining to quantum theory
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