Results 31 to 40 of about 11,396 (164)
Quantum Langevin equation [PDF]
Journal of Statistical Mechanics: Theory and Experiment, 2020 We propose a Langevin equation to describe the quantum Brownian motion of bounded particles based on a distinctive formulation concerning both the fluctuation and dissipation forces. The fluctuation force is similar to that employed in the classical case. It is a white noise with a variance proportional to the temperature.
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Lattice Boltzmann-Langevin Equations
, 1993 Intrinsic fluctuations around the solution of the lattice Boltzmann equation are described or modeled by addition of a white Gaussian noise source. For stationary states a fluctuation-dissipation theorem relates the variance of the fluctuations to the linearized Boltzmann collision operator and the pair correlation function.
Dufty, J.W., Ernst, M.H.
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Complex saddle points and the sign problem in complex Langevin simulation
Nuclear Physics B, 2016 We show that complex Langevin simulation converges to a wrong result within the semiclassical analysis, by relating it to the Lefschetz-thimble path integral, when the path-integral weight has different phases among dominant complex saddle points ...
Tomoya Hayata +2 more
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Linking the Langevin equation to scaling properties of space plasma turbulence at sub-ion scales
Physical Review Research, 2023 Current understanding of the kinetic-scale turbulence in weakly collisional plasmas still remains elusive. We employ a general framework in which the turbulent energy transfer is envisioned as a scale-to-scale Langevin process.
Simone Benella +7 more
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Boundary Value ProblemsThe primary objective of this manuscript is to investigate the existence and uniqueness of solutions for the Langevin ( k , φ ) $(\mathtt{k},\varphi )$ -Hilfer fractional differential equation of different orders with multipoint nonlocal fractional ...
HuiYan Cheng +4 more
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Extension of the Langevin power curve analysis by separation per operational state [PDF]
Wind Energy ScienceIn the last few years, the dynamical characterization of the power output of a wind turbine by means of a Langevin equation has been well established. For this approach, temporally highly resolved measurements of wind speed and power output are used to ...
C. Wiedemann +5 more
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Comptes Rendus. Physique, 2017 The existence of atoms has been long predicted by philosophers and scientists. The development of thermodynamics and of the statistical interpretation of its concepts at the end of the nineteenth century and in the early years of the twentieth century made it possible to bridge the gap of scales between the macroscopic world and the world of atoms ...
Yves Pomeau, Jarosław Piasecki
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The complex chemical Langevin equation [PDF]
The Journal of Chemical Physics, 2014 The chemical Langevin equation (CLE) is a popular simulation method to probe the stochastic dynamics of chemical systems. The CLE’s main disadvantage is its break down in finite time due to the problem of evaluating square roots of negative quantities whenever the molecule numbers become sufficiently small.
David Schnoerr +2 more
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AIP Advances, 2021 The main goal of this article is to investigate the origin of spontaneous emission radiation by applying a new method. In this method, the vibrational Hamiltonian of hydrogen-like atoms (HLAs) is first constructed in accordance with the Hamiltonian of a ...
J. Jahanpanah
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Control of Quantum Langevin Equations [PDF]
Open Systems & Information Dynamics, 2003 The problem of controlling quantum stochastic evolutions arises naturally in several different fields such as quantum chemistry, quantum information theory, quantum engineering, etc. In this paper, we apply the recently discovered closed form of the unitarity conditions for stochastic evolutions driven by the square of white noise [9] to solve this ...
ACCARDI, LUIGI, Bouaks, A.
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