Slot decomposition of continuous Box-Ball Systems

Abstract

We study a piecewise constant function $\hat{I}\cdot :\mathbb{R}\to \{-1,1\}$ with a finite number of discontinuities in any interval. We assume that the associated walk $\hat{I}¾:\mathbb{R}\to \mathbb{R}$ satisfying $\hat{I}{¾}^{\prime }(x)=\hat{I}\cdot (x)$, pinned by $\hat{I}¾(0)=0$, has finite length excursions over past minima. This is the continuous generalization of an initial ball configuration in the discrete Box Ball System introduced by Takahashi and Satsuma, where solitons of integer sizes $k\ge 1$ are identified. We extend the slot decomposition developed by Ferrari, Nguyen, Rolla and Wang in the discrete setting to the continuous case. Each soliton of $\hat{I}¾$ is represented by a point in two dimensional space, one coordinate for position and the other for the soliton height, mapping $\hat{I}¾$ to a point configuration. We consider a distribution on walks given by a product measure on the decomposition of the path into excursions over past minima. Excursions are distributed as products of their solitons weights, which are determined by the soliton heights. We show that when the weight function is in $L^1$ the slot decomposition of $\hat{I}¾$ is a Poisson process. This extends to the continuous case an approach of Ferrari and Gabrielli. As an example, we compute the intensity measure of the Poisson process associated to the asymmetric telegraph process introduced by Kac. In a forthcoming paper we discuss the dynamic properties.

33 pages , 5 figures