Open Access
2021 Dynamical phase transition of ASEP in the KPZ regime
Peter Nejjar
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Electron. J. Probab. 26: 1-20 (2021). DOI: 10.1214/21-EJP642


We consider the asymmetric simple exclusion process (ASEP) on Z. For continuous densities, ASEP is in local equilibrium for large times, at discontinuities however, one expects to see a dynamical phase transition, i.e. a mixture of different equilibriums. We consider ASEP with deterministic initial data such that at large times, two rarefactions come together at the origin, and the density jumps from 0 to 1. Shifting the measure on the KPZ 13 scale, we show that the law of ASEP converges to a mixture of the Dirac measures with only holes resp. only particles. The parameter of that mixture is the probability that the second class particle, which is distributed as the difference of two independent GUEs, stays to the left of the shift. This should be compared with the results of Ferrari and Fontes from 1994 [6], who obtained a mixture of Bernoulli product measures at discontinuities created by random initial data, with the GUEs replaced by Gaussians.

Funding Statement

This work is supported by the Deutsche Forschungsgemeinschaft (German Research Foundation) by the CRC 1060 (Projektnummer 211504053) and Germany’s Excellence Strategy - GZ 2047/1, Projekt ID 390685813.


Download Citation

Peter Nejjar. "Dynamical phase transition of ASEP in the KPZ regime." Electron. J. Probab. 26 1 - 20, 2021.


Received: 13 September 2020; Accepted: 4 May 2021; Published: 2021
First available in Project Euclid: 25 May 2021

Digital Object Identifier: 10.1214/21-EJP642

Primary: 60K35

Keywords: ASEP , dynamical phase transition , KPZ universality

Vol.26 • 2021
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