Velocity Autocorrelation Function in a Four-Dimensional Lattice Gas

Autor:	M.A. van der Hoef, Daan Frenkel, Marjolein Dijkstra
Rok vydání:	1992
Předmět:	Physics Tagged particle Amplitude Computer simulation Lattice (order) Mode coupling Autocorrelation General Physics and Astronomy Scheikunde Molecular physics Cellular automaton
Zdroj:	Europhysics letters, 17(1), 39. EDP sciences
ISSN:	1286-4854 0295-5075
DOI:	10.1209/0295-5075/17/1/008
Popis:	We report simulations of the velocity autocorrelation function (VACF) of a tagged particle in a four-dimensional lattice gas cellular automaton (LGCA). We observe a hydrodynamic tail in the VACF, which decays as t-‘, in agreement with the theoretical predictions. However, in a quantitative comparison, the simulations show that mode-coupling theory underestimates the amplitude of the hydrodynamic tail by (15 + 60)%. The artificial correlations, previously observed in the projected three-dimensional lattice gas model, are found to be absent in this truly 4D model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0623db0e89fe722ce09841eac6a920d7 https://doi.org/10.1209/0295-5075/17/1/008 Zobrazit plný text záznamu