Results 251 to 260 of about 3,269,380 (296)

Gauge-invariant correlation functions

Physical Review D, 1989
A formalism is discussed that gives correlation functions, the poles ofwhich define the physical excitation spectrum in gauge theories. Fermionicexcitations in QED are used as an example. The fermion spectrum in ahigh-temperature plasma is studied as an illustrative application of theformalism. The connection to kinetic theory is made.
, Kapusta, , Toimela
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Time Correlation Functions

2006
In the previous chapter we have seen how spatial correlation functions express useful structural information about our system. This chapter focuses on time correlation functions that, as will be seen, convey important dynamical information. Time correlation functions will repeatedly appear in our future discussions of reduced descriptions of physical ...
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Correlation synthetic discriminant functions

Applied Optics, 1986
Advanced filters are described for distortion-invariant space-invariant object identification and location in clutter using correlators. These correlation synthetic discriminant functions (SDFs) are extensions of earlier projection SDFs. They provide control of the sidelobe levels and the shape of the output correlation function as well as its peak ...
D P, Casasent, W T, Chang
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Thermodynamic functions as correlation-function integrals

The Journal of Chemical Physics, 2013
Expressions of some thermodynamic functions as correlation-function integrals, such as the Ornstein-Zernike integral, the Kirkwood-Buff integrals, and the integral formulas for virial coefficients, are recalled. It is noted, as has been remarked before, that the choice of molecular centers from which intermolecular distances are measured is arbitrary ...
K, Koga, B, Widom
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Correlation Functions as Hydrodynamic Green's Functions

Physical Review, 1968
A formal solution for the thermodynamic variables describing a system in a nonequilibrium state is given in terms of space- and time-dependent correlation functions. The solution during the hydrodynamic stage is also given by the Green's function solution to the hydrodynamic equations. The correlation functions contain information, not contained in the
Dufty, J. W., McLennan, J. A.
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Clusterization of Correlation Functions

2017
Using the Zhu recursion formulas for correlation functions for vertex operator algebras, we introduce a cluster algebra structure over a non-commutative set of variables.
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Structure of correlation functions

Physical Review A, 1991
Experimental determinations of correlation functions typically involve events of differing particle number. In order to interpret such data, it is important to relate these measurements to fixed-number correlations. We exhibit the total correlation function in terms of fixed {ital n} correlations and fluctuations with respect to the average.
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Correlated electronic wave functions: Correlated and transcorrelated wave functions

Physical Review A, 1976
The development of the transcorrelated Hamiltonian method (THM) by Boys and Handy seemed to imply that the determination of atomic and molecular wave functions and energies with full electronic correlation can be done with calculations which involve at worst only pseudo-six-dimensional integrals.
M. W. C. Dharma-wardana, François Grimaldi   +1 more
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Simple but efficient correlation functional from a model pair-correlation function

Physical Review B, 1994
A gradientless correlation functional is derived within the Kohn-Sham density-functional theory (DFT) based on a spin-polarized pair correlation function of Colle-Salvetti type. The functional involves explicitly only the antiparallel spin correlation while parallel-spin correlation is taken into account indirectly in a manner providing self ...
, Proynov, , Salahub
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Fitting the correlation function

Applied Optics, 2000
The whole correlation function of the intensity of scattered light is usually determined from a single realization of the photocurrent. As a result, the values of the correlation function at different delay times are not statistically independent. A standard least-squares fitting procedure is not optimal for an analysis of such data.
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