A model for the generic alpha relaxation of viscous liquids

Details A model for the generic alpha relaxation of viscous liquids A model for the generic alpha relaxation of viscous liquids

2005-03-22

arxiv.org/abs/cond-mat/0503543v3

Europhys. Lett. 71, 646 (2005)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/epl/i2005-10122-3

Dielectric measurements on molecular liquids just above the glass transition indicate that alpha relaxation is characterized by a generic high-frequency loss varying as $\omega^{-1/2}$, whereas deviations from this come from one or more low-lying beta processes [Olsen et al, Phys. Rev. Lett. {\bf 86} (2001) 1271]. Assuming that long-wavelength fluctuations dominate the dynamics, a model for the dielectric alpha relaxation based on the simplest coupling between the density and dipole density fields is proposed here. The model, which is solved in second order perturbation theory in the Gaussian approximation, reproduces the generic features of alpha relaxation.

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