Results 271 to 280 of about 7,300,790 (323)

Fluctuations in laser theories

Physical Review A, 1980
The influence of fluctuations on two models relevant in solid-state laser theory is discussed. One model is the usual solid-state laser model, the other describes a laser with an unstable saturable absorber. For the usual solid-state laser it is shown that fluctuations act as singular perturbations of a bifurcation.
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Fluctuation-dissipation theorem density-functional theory

The Journal of Chemical Physics, 2005
Using the fluctuation-dissipation theorem (FDT) in the context of density-functional theory (DFT), one can derive an exact expression for the ground-state correlation energy in terms of the frequency-dependent density response function. When combined with time-dependent density-functional theory, a new class of density functionals results that use ...
Filipp, Furche, Troy, Van Voorhis
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A Theory of Commodity Price Fluctuations

Journal of Political Economy, 1996
This paper studies the price fluctuations of storable commodities that are traded in open markets and are subject to random shocks to demand or, more particularly, to supply. It relaxes the common assumption that the shocks are identically and independently distributed in favor of temporally dependent and periodic disturbances.
Chambers, Marcus J, Bailey, Roy E
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Theory of stress fluctuations

Physical Review E, 2000
The current status of the theory of stress fluctuations is marked by two circumstances: no currently available formulas are valid for a metallic system, and a series of contradictory formulas remains unresolved. Here we derive formulas for shear- and isotropic-stress energy fluctuations, in the primary statistical mechanics ensembles.
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Thermodynamic Critical Fluctuation Theory?

Physical Review Letters, 1983
The conventional thermodynamic fluctuation theory does not include local correlations and, hence, fails at volumes of the order of the correlation volume ${\ensuremath{\xi}}^{d}$. In this paper, an attempt is made to include local correlations in a thermodynamic theory by considering fluctuations in a sequence of concentric systems of decreasing volume.
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Kinetic Theory of Fluctuations

1995
In the preceding chapters we considered two approaches to the derivation of kinetic equation for rarefied gas. The first is based on physical intuition and goes back to Boltzmann himself. The second approach, called the Bogolyubov — Born — Green — Kirkwood — Yvon method, relies on the reversible Liouville equation.
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The Theory of Fluctuations

2014
Thermodynamic systems at equilibrium are characterized by fluctuations that are a manifestation of their discrete nature at microscopic scales. We have already seen some examples of such fluctuations: those in the number of particle \(\Delta N\) in a certain volume \(V\) of a gas; the energy fluctuations in a system in contact with a heat bath.
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A fluctuation theory of communications

Quantum Studies: Mathematics and Foundations, 2019
B. N. Tiwari, P. K. Kalra
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Flux Large Deviations of Independent and Reacting Particle Systems, with Implications for Macroscopic Fluctuation Theory

Journal of statistical physics, 2018
D. M. Renger
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Theories of Business Fluctuations

2017
Starting already in the nineteenth century, many economists observed that business fluctuations took place with regularity, though they differed on their periodicity. This chapter discusses briefly the more important theories that have been posited to explain these fluctuations, and pays particular attention to those focusing on the role played by the ...
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