Seminário Geral 06/05/2022: “What is the entropy of a tiger?”

There is an old temptation to formally extend notions of entropy to nonequilibrium systems  (e.g. as (neg)information as is somewhat fashionable today).  In the original formulation, equilibrium entropy refers to heat transfer (Clausius) and to (energetic) degeneracies (Boltzmann-Planck), and has been foundational to equilibrium statistical mechanics for giving the probability of fluctuations and the structure of linear response. To reconciliate in one entropy these various tasks for nonequilibrium systems as well sadly fails, except when close-to-equilibrium.  Yet, tigers are far from equilibrium. The good news is that nonequilibrium heat capacities may still inform us about thermal properties of driven and active systems. They pick up kinetic (frenetic) contributions, going much beyond thermodynamic information.

Tópico: Seminário Geral: 06/05/2022
Hora: 6 mai. 2022 10:00 da manhã São Paulo

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