Continuum Limit for Some Growth Models II
Rezakhanlou, Fraydoun
Ann. Probab., Tome 29 (2001) no. 1, p. 1329-1372 / Harvested from Project Euclid
We continue our investigations on a class of growth models introduced in a previous paper. Given a nonnegative function $v: \mathbb{Z}^d \to \mathbb{Z}$ with $v(0) = 0$, we define the space of configurations $\Gamma$ to consist of functions $h: \mathbb{Z}^d \to \mathbb{Z}$ such that $h(i) - h(j) \leq v(i - j)$ for all i$i, j \epsilon \mathbb{Z}^d$. We then take two sequances of independent Poisson clocks $(p^{\pm}(i, t): i \epsilon \mathbb{Z}^d)$ of rates $\lambda^{\pm}$. We start with a possibly random configuration $h \epsilon \Gamma$. The function $h$ increases (respectively, decreases) by one unit at site $i$, when the clock $p^{+}(i, \cdot)$ [respectively, $p^{-}(i, \cdot)$] rings and the resulting configuration is still in $\Gamma$. Otherwise the change in h is suppressed. In this way we have a process $h(i, t)$ that after a rescaling $u^{\varepsilon}(x, t) = \varepsilonh([\frac{x}{\varepsilon}], \frac{t}{\varepsilon})$ is expected to converge to a function $u(x, t)$ that solves a Hamilton-Jacobi equation of the form $u_t + H(u_x) = 0$. We established this when $\lambda^{-}$ or $\lambda^{+} = 0$ in the previous paper, employing a strong monotonicity property of the process $h(i, t)$. Such property is no longer available when both $\lambda^{+}, \lambda^{-}$ are nonzero. In this paper we initiate a new approach to treat the problem when th dimension is 1 and the set $\Gamma$ can be described by local constraints on the configuration $h$. In higher dimensions, we can only show that any limit point of th processes $u^{varepsilon}$ is a process $u$ that satisfies a Hamilton-Jacobi equation for a suitable (possibly random) Hamiltonian $H$.
Publié le : 2001-07-14
Classification:  Stochastic growth models,  Hamilton-Jacobi equation,  60K35,  82C22
@article{1015345605,
     author = {Rezakhanlou, Fraydoun},
     title = {Continuum Limit for Some Growth Models II},
     journal = {Ann. Probab.},
     volume = {29},
     number = {1},
     year = {2001},
     pages = { 1329-1372},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1015345605}
}
Rezakhanlou, Fraydoun. Continuum Limit for Some Growth Models II. Ann. Probab., Tome 29 (2001) no. 1, pp.  1329-1372. http://gdmltest.u-ga.fr/item/1015345605/