Results 31 to 40 of about 7,760 (253)

Fluctuation-dissipation theorem for non-equilibrium quantum systems [PDF]

open access: yesQuantum, 2018
The fluctuation-dissipation theorem (FDT) is a central result in statistical physics, both for classical and quantum systems. It establishes a relationship between the linear response of a system under a time-dependent perturbation and time correlations ...
Mohammad Mehboudi   +2 more
doaj   +1 more source

Testing the Steady-State Fluctuation Relation in the Solar Photospheric Convection

open access: yesEntropy, 2020
The turbulent thermal convection on the Sun is an example of an irreversible non-equilibrium phenomenon in a quasi-steady state characterized by a continuous entropy production rate.
Giorgio Viavattene   +7 more
doaj   +1 more source

Fluctuation theorem and chaos [PDF]

open access: yesThe European Physical Journal B, 2008
The heat theorem (i.e. the second law of thermodynamics or the existence of entropy) is a manifestation of a general property of hamiltonian mechanics and of the ergodic Hypothesis. In nonequilibrium thermodynamics of stationary states the chaotic hypothesis plays a similar role: it allows a unique determination of the probability distribution (called {
openaire   +4 more sources

Fluctuation theorem in rachet system [PDF]

open access: yesJournal of Physics A: Mathematical and General, 2004
Fluctuation Theorem(FT) has been studied as far from equilibrium theorem, which relates the symmetry of entropy production. To investigate the application of this theorem, especially to biological physics, we consider the FT for tilted rachet system. Under, natural assumption, FT for steady state is derived.
openaire   +2 more sources

Design principles for enhancing phase sensitivity and suppressing phase fluctuations simultaneously in biochemical oscillatory systems

open access: yesNature Communications, 2018
Biochemical processes require both high sensitivity and low fluctuation which is incompatible with the fluctuation dissipation theorem. Here Fei et al. model biochemical oscillators to show how free energy dissipation leads to both a suppression of phase
Chenyi Fei   +3 more
doaj   +1 more source

Microcanonical quantum fluctuation theorems [PDF]

open access: yesPhysical Review E, 2008
Previously derived expressions for the characteristic function of work performed on a quantum system by a classical external force are generalized to arbitrary initial states of the considered system and to Hamiltonians with degenerate spectra. In the particular case of microcanonical initial states explicit expressions for the characteristic function ...
Talkner, Peter   +2 more
openaire   +3 more sources

Fluctuation theorem between non-equilibrium states in an RC circuit

open access: yesNew Journal of Physics, 2015
Fluctuation theorems impose constraints on the probability of observing negative entropy production in small systems driven out of equilibrium. The range of validity of fluctuation theorems has been extensively tested for transitions between equilibrium ...
L Granger   +4 more
doaj   +1 more source

Entropy production of a closed Hamiltonian system via the detailed fluctuation relation

open access: yesPhysical Review Research, 2021
We revisit the problem of emergent irreversibility in a closed Hamiltonian system in light of the detailed fluctuation relation by invoking an imperfect Loschmidt demon that performs a time-reversal operation with a finite precision.
Yûto Murashita   +2 more
doaj   +1 more source

Using the fluctuation-dissipation theorem for nonconservative forces

open access: yesPhysical Review Research, 2019
An equilibrium system which is perturbed by an external potential relaxes to a new equilibrium state, a process obeying the fluctuation-dissipation theorem.
Kiryl Asheichyk, Matthias Krüger
doaj   +1 more source

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