The Three Faces of the Second Law: I. Master Equation Formulation

We propose a new formulation of stochastic thermodynamics for systems subjected to nonequilibrium constraints (i.e. broken detailed balance at steady state) and furthermore driven by external time-dependent forces. A splitting of the second law occurs in this description leading to three second law like relations. The general results are illustrated on specific solvable models. The present paper uses a master equation based approach.