Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium

Details Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium

2001-11-24

arxiv.org/abs/cond-mat/0111467v1

Phys. Rev. E 64, 057101, 2001

Physics

Condensed Matter

Statistical Mechanics

REVTEX +3 ps figures

Scientific paper

10.1103/PhysRevE.64.057101

The realization of idea of time-scale invariance for relaxation processes in liquids has been performed by the memory functions formalism. The best agreement with experimental data for the dynamic structure factor $S(k,\omega)$ of liquid cesium near melting point in the range of wave vectors ($0.4 \ang^{-1} \leq k \leq 2.55 \ang^{-1}$) is found with the assumption of concurrence of relaxation scales for memory functions of third and fourth orders. Spatial dispersion of the four first points in spectrum of statistical parameter of non-Markovity $ \epsilon_{i}(k,\omega)$ at $i=1,2,3,4$ has allowed to reveal the non-Markov nature of collective excitations in liquid cesium, connected with long-range memory effect.

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