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Dynamics of a Tagged Particle in the Asymmetric Exclusion Process with the Step Initial Condition

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Abstract

The one-dimensional totally asymmetric simple exclusion process (TASEP) is considered. We study the time evolution property of a tagged particle in the TASEP with the step initial condition. Calculated is the multi-time joint distribution function of its position. Using the relation of the dynamics of the TASEP to the Schur process, we show that the function is represented as the Fredholm determinant. We also study the scaling limit. The universality of the largest eigenvalue in the random matrix theory is realized in the limit. When the hopping rates of all particles are the same, it is found that the joint distribution function converges to that of the Airy process after the time at which the particle begins to move. On the other hand, when there are several particles with small hopping rate in front of a tagged particle, the limiting process changes at a certain time from the Airy process to the process of the largest eigenvalue in the Hermitian multi-matrix model with external sources.

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Authors and Affiliations

  1. Institute of Industrial Science, University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8505, Japan

    T. Imamura

  2. Department of Mathematics and Informatics, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba, 263-8522, Japan

    T. Sasamoto

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  1. T. Imamura
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Imamura, T., Sasamoto, T. Dynamics of a Tagged Particle in the Asymmetric Exclusion Process with the Step Initial Condition. J Stat Phys 128, 799–846 (2007). https://doi.org/10.1007/s10955-007-9326-9

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  • DOI: https://doi.org/10.1007/s10955-007-9326-9

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