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Qu'est-ce (qui) est GW approximation - définition
GW approximation
IN PHYSICS, AN ESTIMATE OF THE SELF-ENERGY OF A MANY-BODY SYSTEM
The GW approximation (GWA) is an approximation made in order to calculate the self-energy of a many-body system of electrons. The approximation is that the expansion of the self-energy Σ in terms of the single particle Green's function G and the screened Coulomb interaction W (in units of \hbar=1)
Two-stream approximation
DISCRETE ORDINATE APPROXIMATION IN WHICH RADIATION PROPAGATING ALONG ONLY TWO DISCRETE DIRECTIONS IS CONSIDERED
Two stream approximation (radiative transfer); Two-stream approximation (radiative transfer); Two-Stream Approximation
In models of radiative transfer, the two-stream approximation is a discrete ordinate approximation in which radiation propagating along only two discrete directions is considered. It was first used by Arthur Schuster in 1905.
Sigma approximation
METHOD OF ADJUSTING A FOURIER SUMMATION TO GREATLY REDUCE THE GIBBS PHENOMENON, WHICH WOULD OTHERWISE OCCUR AT DISCONTINUITIES.
Sigma-approximation; Lanczos sigma factor; Lanczos σ factor
In mathematics, σ-approximation adjusts a Fourier summation to greatly reduce the Gibbs phenomenon, which would otherwise occur at discontinuities.
