Christian Maes, Alberto Salazar
We elaborate on an observation of Maes-van Wieren (2006) to obtain fluctuation symmetries also for time-symmetric quantities. Examples are given, analytic and numerical, yielding time-symmetric path-observables with fluctuations satisfying a Gallavotti-Cohen type symmetry. From these results one is actually introduced to stationary nonequilibrium by a different phenomenology. It deals with a complementary class of what we may call {\it active} fluctuation symmetries, again general non-perturbative nonequilibrium relations but not expressed in terms of the traditional dissipative variables; they rather involve the notion of dynamical activity. In particular, we derive Green-Kubo like relations for differences in dynamical activity. The illustrations include boundary driven Kawasaki and zero range models and the spinning Lorentz gas.
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http://arxiv.org/abs/1305.0736
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