Enumerative combinatorics
The stationary measure of a 2-type totally asymmetric exclusion process
Journal of Combinatorial Theory Series A
A combinatorial approach to jumping particles: The parallel TASEP
Random Structures & Algorithms
The structure of alternative tableaux
Journal of Combinatorial Theory Series A
Greek letters in random staircase tableaux
Random Structures & Algorithms
Theoretical Computer Science
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In this paper we consider a model of particles jumping on a row of cells, called in physics the one-dimensional totally asymmetric exclusion process (TASEP). More precisely, we deal with the TASEP with open or periodic boundary conditions and with two or three types of particles. From the point of view of combinatorics a remarkable feature of this Markov chain is that it involves Catalan numbers in several entries of its stationary distribution.We give a combinatorial interpretation and a simple proof of these observations. In doing this we reveal a second row of cells, which is used by particles to travel backward. As a byproduct we also obtain an interpretation of the occurrence of the Brownian excursion in the description of the density of particles on a long row of cells.