an:03852183
Zbl 0536.60097
Andjel, Enrique D.; Kipnis, Claude
Derivation of the hydrodynamical equation for the zero-range interaction process
EN
Ann. Probab. 12, 325-334 (1984).
00149050
1984
j
60K35 60J70
hydrodynamic equation; local equilibrium; zero range process
In continuation of the reviewer's paper in Z. Wahrscheinlichkeitstheor. Verw. Geb. 58, 41-53 (1981; Zbl 0451.60097) the property of local equilibrium for the asymmetric zero range process with particular initial states is established and the evolution of the parameter characterizing the local equilibria is derived.
The model is given by the Markov process on \(N^ Z\) whose generator is \(Lf(\eta)=\sum_{i}1_{\{\eta_ i>0\}}.(f(\eta^ i)-f(\eta))\), where \(\eta^ i\) is obtained from \(\eta\) by moving a particle from i to \(i+1\). The equilibria are the product measures \(\nu_{\rho}\), \(0<\rho<\infty\), with \(\nu_{\rho}(\eta_ i=k)=(\rho /1+\rho)^ k\cdot(1+\rho)^{-1}\), \(k\geq 0.\)
The result may roughly be stated as follows: Rescale space and time by the same factor \(\epsilon\) ; then, as \(\epsilon\) tends to zero, the macroscopic density profile \(\rho\) (x,t) evolves according to the equation
\[
\frac{\partial \rho}{\partial t}+\frac{\partial \rho}{\partial x}\cdot(1+\rho)^{-2}=0,
\]
if the initial density \(\rho\) (0,.) satisfies one of the following two conditions: (a) it is an increasing step function taking on only two values (Th.2.4); (b) it is decreasing and differentiable (Th.3.3).
H.Rost
Zbl 0451.60097