The Popkov-Sch\"utz two-lane lattice gas: Universality for general jump rates
Abstract
We consider the asymmetric version of the Popkov-Sch\"utz two-lane lattice gas with general jump rates, subject to the stationary measure being of product form. This still leaves five free parameters. At density 1/2 the eigenvalues of the flux Jacobian are degenerate. We compute the second order expansion of the average fluxes at density 1/2 and thereby identify the universality classes.
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