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arXiv · 2607.24637

Type $C$ multiline queues and the open-boundary TASEP

Olya Mandelshtam·Jerónimo Valencia-Porras
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Abstract

The totally asymmetric simple exclusion process (TASEP) with open boundaries is a finite Markov chain describing particles hopping between adjacent sites on a one-dimensional lattice with left and right boundary transitions governed by parameters $\alpha$ and $\beta$. The multispecies TASEP is a higher-rank generalization in which particles have different species. Multiline queues were introduced by Ferrari and Martin (2007) to compute the stationary distribution of the multispecies TASEP on a circle. It has remained an open problem to find a combinatorial formula for the stationary distribution of the multispecies open-boundary TASEP. Using Kirillov--Reshetikhin crystals of type $C$, we construct type $C$ multiline queues and a corresponding Ferrari--Martin pairing algorithm that projects them to TASEP configurations. This yields a combinatorial formula for the stationary distribution of the multispecies open-boundary TASEP for the $\alpha=\beta=1$ specialization.

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Olya Mandelshtam, Jerónimo Valencia-Porras. 2026-07-27. Type $C$ multiline queues and the open-boundary TASEP. https://arxiv.org/abs/2607.24637

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