Christian Maes, Frank Redig
Positivity of Entropy Production
(404K, Postscript)

ABSTRACT.  We discuss the positivity of the mean entropy production for stochastic 
systems driven from equilibrium, as it was defined previously by us 
in connection with a fluctuation theorem. 
Non-zero entropy production is closely linked with violation of the 
detailed balance condition. This connection is rigorously obtained 
for spinflip dynamics. 
We remark that the positivity of entropy production depends on the 
choice of time-reversal transformation, hence on the choice of the 
dynamical variables in the system of interest.