Thermodynamics of the glassy state: effective temperature as an additional system parameter

Details Thermodynamics of the glassy state: effective temperature as an additional system parameter Thermodynamics of the glassy state: effective temperature as an additional system parameter

1998-05-06

arxiv.org/abs/cond-mat/9805069v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, REVTEX. Phys. Rev. Lett, to appear

Scientific paper

10.1103/PhysRevLett.80.5580

A system is glassy when the observation time is much smaller than the equilibration time. A unifying thermodynamic picture of the glassy state is presented. Slow configurational modes are in quasi-equilibrium at an effective temperature. It enters thermodynamic relations with the configurational entropy as conjugate variable. Slow fluctuations contribute to susceptibilities via quasi-equilibrium relations, while there is also a configurational term. Fluctuation-dissipation relations also involve the effective temperature. Fluctuations in the energy are non-universal, however. The picture is supported by analytically solving the dynamics of a toy model.

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