Upcoming events

  • Clore Seminar on Soft and Biological Physics – Sundays, 13:00, Drory Auditorium
  • Statistical Physics Seminar – Mondays, 14:15, Seminar Room A
  • Atomic, Molecular, and Optical Seminar (AMOS) – Tuesdays, 13:15, Weismann Auditorium

A quantitative footprint of irreversibility in the absence of observable currents

DateMonday, December 9, 2019



LecturerGili Bisker

LocationEdna and K.B. Weissman Building of Physical Sciences

AbstractTime irreversibility is the hallmark of nonequilibrium dissipative processes. Detecting dissipation is essential for our basic understanding of the underlying physical mechanism, however, it remains a challenge in the absence of observable directed motion, flows, or fluxes. Additional difficulty arises in complex systems where many internal degrees of freedom are inaccessible to an external observer. In living systems, for example, the dissipation is directly related to the hydrolysis of fuel molecules such as adenosine triphosphate (ATP), whose consumption rate is difficult to directly measure in many experimental setups. In this talk, I will introduce a novel approach to detect time irreversibility and estimate the entropy production from time-series measurements, even in the absence of observable currents. This method can be implemented in scenarios where only partial information is available and thus provides a new tool for studying nonequilibrium phenomena. 1. G. Bisker et al. Inferring broken detailed balance in the absence of observable currents, Nature Communications, 10(1), 1-10 (2019) 2. G. Bisker et al. Hierarchical Bounds on Entropy Production Inferred from Partial Information, Journal of Statistical Mechanics: Theory and Experiment (9), 093210 (2017)

New directions for diffusive processes: defect formation through a nonequilibrium phase transition, open quantum systems and uncertainty relations in mesoscopic systems

DateMonday, December 23, 2019


DetailsCollege de France

LecturerOhad Shpielberg

LocationEdna and K.B. Weissman Building of Physical Sciences

AbstractThe macroscopic fluctuation theory gives an efficient hydrodynamic description for classical nonequilibrium diffusive systems. In this talk, we would cover how it can be applied and generalised in three directions: a. Towards a theory for open quantum diffusive systems, comparable to the macroscopic fluctuation theory. b. Defect formation as a system is (slowly) driven in time through a continuous phase transition can be described by a scaling theory - the Kibble-Zurek Mechanism. The macroscopic fluctuation theory allows to explore the exact evolution of defects for a large set of cases. Thus, we are in a position to go beyond the scaling arguments of the Kibble-Zurek Mechanism. c. The recently discovered thermodynamic uncertainty relations define a transport efficiency in thermal systems showing that the mean current, current fluctuations and dissipation are intimately linked. Here we will briefly show how this idea can be extended to (athermal) mesoscopic coherent processes.

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