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Extended Gibbs ensembles with flow

Abstract : A recently proposed [Ph. Chomaz, F. Gulminelli, and O. Juillet, Ann. Phys. (Paris) 320, 135 (2005)] statistical treatment of finite unbound systems in the presence of collective motions is applied to a classical Lennard-Jones system, numerically simulated through molecular dynamics. In the ideal gas limit, the flow dynamics can be exactly recast into effective time-dependent Lagrange parameters acting on a standard Gibbs ensemble with an extra total energy conservation constraint. Using this same ansatz for the low-density freeze-out configurations of an interacting expanding system, we show that the presence of flow can have a sizable effect on the microstate distribution.
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Submitted on : Friday, November 27, 2009 - 11:15:17 AM
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M.J. Ison, F. Gulminelli, C.O. Dorso. Extended Gibbs ensembles with flow. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2007, 76, pp.051120. ⟨10.1103/PhysRevE.76.051120⟩. ⟨in2p3-00337203⟩



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