2003/12/31 by Jeppe C. Dyre · 2 citations
Materials Science · Physics and Astronomy · #Material Dynamics and Properties #NMR spectroscopy and applications #Spectroscopy and Quantum Chemical Studies #cond-mat.soft
paper · pdf · doi:10.1103/physreve.72.011501
published as Phys. Rev. E 72, 011501 (2005)
openalex publication_date 2005/07/01 · arxiv created 2005/07/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
It is suggested that the omega(-1/2) high-frequency decay of the alpha loss in highly viscous liquids, which appears to be generic, is a manifestation of a negative long-time tail as typically encountered in stochastic dynamics. The proposed mechanism requires that the coherent diffusion constant is much larger than estimated from the alpha relaxation time. This is justified by reference to the solidity of viscous liquids in an argument which, by utilizing the irrelevance of momentum conservation at high viscosity and introducing a center of mass diffusion constant, implies that at high viscosity the coherent diffusion constant is much larger than the incoherent diffusion constant.