Authors
Sune Jespersen, Ralf Metzler, Hans C Fogedby
Publication date
1999/3/1
Journal
Physical Review E
Volume
59
Issue
3
Pages
2736
Publisher
American Physical Society
Description
We consider Lévy flights subject to external force fields. This anomalous transport process is described by two approaches, a Langevin equation with Lévy noise and the corresponding generalized Fokker-Planck equation containing a fractional derivative in space. The cases of free flights, constant force, and linear Hookean force are analyzed in detail, and we corroborate our findings with results from numerical simulations. We discuss the non-Gibbsian character of the stationary solution for the case of the Hookean force, ie, the deviation from Boltzmann equilibrium for long times. The possible connection to Tsallis’s q statistics is studied.
Total citations
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