Abstract
The heat theorem (i.e. the second law of thermodynamics or the existence of entropy) is a manifestation of a general property of hamiltonian mechanics and of the ergodic hypothesis. In nonequilibrium thermodynamics of stationary states the chaotic hypothesis plays a similar role: it allows a unique determination of the probability distribution (called SRB distribution) on phase space providing the time averages of the observables. It also implies an expression for a few averages concrete enough to derive consequences of symmetry properties like the fluctuation theorem or to formulate a theory of coarse graining unifying the foundations of equilibrium and of nonequilibrium.
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Gallavottia, G. Fluctuation theorem and chaos. Eur. Phys. J. B 64, 315–320 (2008). https://doi.org/10.1140/epjb/e2008-00137-6
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DOI: https://doi.org/10.1140/epjb/e2008-00137-6