Seminário do Grupo de Física Estatística – FGE
“Cost and precision in stochastic thermodynamics”
Palestrante: Dr. André C. Barato (MPIPKS)
Dia: 25 de abril, quarta-feira, às 15h.
Local: Sala 201, Ala 1, Sala de Seminários, IFUSP.
Abstract:
Stochastic Thermodynamics is a theoretical framework under development that generalizes standard thermodynamics to systems that can be small and far from equilibrium. Examples of such systems are biological molecules like molecular motors, artificial molecular pumps, colloidal particles, and small electronic systems. The main result of the field is the fluctuation theorem, which is a symmetry on the probability distribution of a fluctuating entropy that implies the second law. In this talk, we discuss the main concepts of stochastic thermodynamics and introduce some of our findings on the relation between energetic cost and precision. In particular, the novel thermodynamic uncertainty relation establishes a universal minimal energetic cost of precision associated with a quantity like the output of chemical reaction (or any other generic thermodynamic flux). In simple words, an uncertainty of 1% associated with such quantity has a minimal universal cost of 20.000 k_BT. Other key contributions that will be presented in this talk are: possible applications of this thermodynamic uncertainty relation, bounds on current fluctuations, the relation between cost and precision in periodically driven systems, and a bound on the number of coherent oscillations in biochemical systems.
