- perturbation-theory approximation
- приближение теории возмущений
English-russian dictionary of physics. 2013.
perturbation-theory approximation
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Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a … Wikipedia
Perturbation theory — This article describes perturbation theory as a general mathematical method. For perturbation theory as applied to quantum mechanics, see perturbation theory (quantum mechanics). Perturbation theory comprises mathematical methods that are used to … Wikipedia
Møller–Plesset perturbation theory — Electronic structure methods Tight binding Nearly free electron model Hartree–Fock method Modern valence bond Generalized valence bond Møller–Plesset perturbation th … Wikipedia
K·p perturbation theory — In solid state physics, k·p perturbation theory is an approximation scheme for calculating the band structure (particularly effective mass) and optical properties of crystalline solids. It is pronounced k dot p , and is also called the k·p method … Wikipedia
Cosmological perturbation theory — See also: structure formation , cosmic microwave background radiation , and general relativity In physical cosmology, cosmological perturbation theory is the theory by which the evolution of structure is understood in the big bang model. It… … Wikipedia
Møller-Plesset perturbation theory — (MP) is one of several quantum chemistry post Hartree Fock ab initio methods in the field of computational chemistry. It improves on the Hartree Fock method by adding electron correlation effects by means of Rayleigh Schrödinger perturbation… … Wikipedia
Chiral perturbation theory — (ChPT) is an effective field theory constructed with a Lagrangian consistent with the (approximate) chiral symmetry of quantum chromodynamics (QCD), as well as the other symmetries of parity and charge conjugation. ChPT is a theory which allows… … Wikipedia
Perturbation — or perturb may refer to any of numerous concepts in several fields:* Perturbation theory, mathematical methods that give approximate solutions to problems that cannot be solved exactly * Perturbation (geology), changes in the nature of alluvial… … Wikipedia
Théorie de la perturbation (mécanique quantique) — En mécanique quantique, la théorie de la perturbation (ou théorie des perturbations) est un ensemble de schémas d approximations liée à une perturbation mathématique utilisée pour décrire un système quantique complexe de façon simplifiée. L idée… … Wikipédia en Français
Théorie de la perturbation (chimie quantique) — Théorie de la perturbation (mécanique quantique) En mécanique quantique, la théorie de la perturbation (ou théorie des perturbations) est un ensemble de schémas d approximations liée à une perturbation mathématique utilisée pour décrire un… … Wikipédia en Français
Singular perturbation — In mathematics, more precisely in perturbation theory, a singular perturbation problem is a problem containing a small parameter that cannot be approximated by setting the parameter value to zero. This is in contrast to regular perturbation… … Wikipedia
