Transition probabilities and dynamic structure factor in the ASEP conditioned on strong flux

Details Transition probabilities and dynamic structure factor in the ASEP conditioned on strong flux Transition probabilities and dynamic structure factor in the ASEP conditioned on strong flux

2010-11-17

arxiv.org/abs/1011.3913v1

J. Stat. Phys 142, Issue 3, p. 627 (2011)

Physics

Condensed Matter

Statistical Mechanics

16 pages, 2 figures

Scientific paper

We consider the asymmetric simple exclusion processes (ASEP) on a ring constrained to produce an atypically large flux, or an extreme activity. Using quantum free fermion techniques we find the time-dependent conditional transition probabilities and the exact dynamical structure factor under such conditioned dynamics. In the thermodynamic limit we obtain the explicit scaling form. This gives a direct proof that the dynamical exponent in the extreme current regime is $z=1$ rather than the KPZ exponent $z=3/2$ which characterizes the ASEP in the regime of typical currents. Some of our results extend to the activity in the partially asymmetric simple exclusion process, including the symmetric case.

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