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- W2054484711 abstract "Hamiltonian trajectories are strictly time-reversible. Any time series of Hamiltonian coordinates {q} satisfying Hamilton's motion equations will likewise satisfy them when played backwards, with the corresponding momenta changing signs : {+p} --> {-p}. Here we adopt Levesque and Verlet's precisely bit-reversible motion algorithm to ensure that the trajectory reversibility is exact, with the forward and backward sets of coordinates identical. Nevertheless, the associated instantaneous instability, or sensitive dependence on initial conditions of (or Lyapunov unstable) bit-reversible coordinate trajectories can still exhibit an exponentially growing time-symmetry-breaking irreversibility. Surprisingly, the positive and negative exponents, as well as the forward and backward spectra, are usually not closely related, and so give four differing topological measures of local chaos. We have demonstrated this symmetry breaking for fluid shockwaves, for free expansions, and for chaotic molecular collisions. Here we illustrate and discuss this time-symmetry breaking for three statistical-mechanical systems, [1] a minimal (but still chaotic) one-body cell model with a four-dimensional phase space; [2] relatively small colliding crystallites, for which the whole spectrum is accessible; [3] a near-continuum inelastic collision of two larger 400-particle balls. In the last two of these pedagogical problems the two colliding bodies coalesce. The particles most prone to instability are dramatically different in the two time directions. Thus this Lyapunov-based symmetry breaking furnishes an interesting Arrow of Time." @default.
- W2054484711 created "2016-06-24" @default.
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- W2054484711 date "2013-02-11" @default.
- W2054484711 modified "2023-09-23" @default.
- W2054484711 title "Time-Symmetry Breaking in Hamiltonian Mechanics" @default.
- W2054484711 hasPublicationYear "2013" @default.
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