### Abstract

Dielectric measurements on molecular liquids just above the glass transition indicate that alpha relaxation is characterized by a generic high-frequency loss varying as one over square root of frequency, whereas deviations from this come from one or more low-lying beta processes [Olsen et al., Phys. Rev. Lett., 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.

Originalsprog | Udefineret/Ukendt |
---|---|

Tidsskrift | EPL |

Vol/bind | 71 |

Udgave nummer | 4 |

Sider (fra-til) | 646-650 |

ISSN | 0295-5075 |

DOI | |

Status | Udgivet - 2005 |

## Citer dette

Dyre, J. (2005). A model for the generic alpha relaxation in viscous liquids.

*EPL*,*71*(4), 646-650. https://doi.org/10.1209/epl/i2005-10122-3