Test of nonequilibrium thermodynamics in glassy systems: the soft-sphere case.
The scaling properties of the soft-sphere potential allow the derivation of an exact expression for the pressure of a frozen liquid, i.e., the pressure corresponding to configurations which are local minima in its multidimensional potential energy landscape. The existence of such a relation offers the unique possibility for testing the recently proposed extension of the liquid free energy to glassy out-of-equilibrium conditions and the associated expression for the temperature of the configurational degrees of freedom. We demonstrate that the nonequilibrium free energy provides an exact description of the soft-sphere pressure in glass states.
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Dipartimento di Fisica, INFM UdR, Università di Roma La Sapienza, Piazzate Aldo Moro 5, I-00185 Rome, Italy.
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