1,721,275 research outputs found
Linear response in large deviations theory: a method to compute non-equilibrium distributions
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Exact fluctuation theorem without ensemble quantities
Full text linkpeer reviewedEvaluating the entropy production (EP) along a stochastic trajectory requires the knowledge of the system probability distribution, an ensemble quantity notoriously difficult to measure. In this letter, we show that the EP of nonautonomous systems in contact with multiple reservoirs can be expressed solely in terms of physical quantities measurable at the single trajectory level with a suitable preparation of the initial condition. As a result, we identify universal energy and particle fluctuation relations valid for any measurement time. We apply our findings to an electronic junction model which may be used to verify our prediction experimentally
Local detailed balance across scales: From diffusions to jump processes and beyond
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Bridging Freidlin-Wentzell large deviations theory and stochastic thermodynamics
No full textFor overdamped Langevin systems subjected to weak thermal noise and nonconservative forces, we establish a connection between Freidlin-Wentzell large deviations theory and stochastic thermodynamics. First, we derive a series expansion of the quasipotential around the detailed-balance solution, that is, the system's free energy, and identify the conditions for the linear response regime to hold, even far from equilibrium. Second, we prove that the escape rate from dissipative fixed points of the macroscopic dynamics is bounded by the entropy production of trajectories that relax into and escape from the attractors. These results provide the foundation to study the nonequilibrium thermodynamics of dissipative metastable states
Quantum-dot Carnot engine at maximum power
Full text linkpeer reviewedWe evaluate the efficiency at maximum power of a quantum-dot Carnot heat engine. The universal values of
the coefficients at the linear and quadratic order in the temperature gradient are reproduced. Curzon-Ahlborn
efficiency is recovered in the limit of weak dissipation
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