Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-05-27
J. Phys. A: Math. Theor. 41 (2008) 365003
Physics
Condensed Matter
Statistical Mechanics
21 pages, 3 figures
Scientific paper
10.1088/1751-8113/41/36/365003
We use functional Bethe Ansatz equations to calculate the cumulants of the total current in the partially asymmetric exclusion process. We recover known formulas for the first two cumulants (mean value of the current and diffusion constant) and obtain an explicit finite size formula for the third cumulant. The expression for the third cumulant takes a simple integral form in the limit where the asymmetry scales as the inverse of the square root of the size of the system, which corresponds to a natural separation between weak and strong asymmetry.
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