commutation — [ kɔmytasjɔ̃ ] n. f. • déb. XIIe; lat. commutatio « changement » 1 ♦ Didact. Substitution, remplacement. Commutation et permutation. Spécialt Substitution d un élément par un autre, dégageant des distinctions pertinentes (notamment en… … Encyclopédie Universelle
Commutation Act — The Commutation Act of 1784, enacted by the British Parliament, reduced the tax on tea from 119% to 12.5%, effectively ending the smuggling trade. William Pitt the Younger, acting on the advice of Richard Twining of the Twinings Tea Company,… … Wikipedia
Canonical commutation relation — In physics, the canonical commutation relation is the relation between canonical conjugate quantities (quantities which are related by definition such that one is the Fourier transform of another), for example: between the position x and momentum … Wikipedia
Neutrino theory of light — The neutrino theory of light is the proposal that the photon is a composite particle formed of a neutrino antineutrino pair. It is based on the idea that emission and absorption of a photon corresponds to the creation and annihilation of a… … Wikipedia
Stone–von Neumann theorem — In mathematics and in theoretical physics, the Stone–von Neumann theorem is any one of a number of different formulations of the uniqueness of the canonical commutation relations between position and momentum operators. The name is for Marshall… … Wikipedia
Matrix mechanics — Quantum mechanics Uncertainty principle … Wikipedia
Angular momentum — For a generally accessible and less technical introduction to the topic, see Introduction to angular momentum. Classical mechanics Newton s Second Law … Wikipedia
Path integral formulation — This article is about a formulation of quantum mechanics. For integrals along a path, also known as line or contour integrals, see line integral. The path integral formulation of quantum mechanics is a description of quantum theory which… … Wikipedia
Bosonic field — In quantum field theory, a bosonic field is a quantum field whose quanta are bosons; that is, they obey Bose Einstein statistics. Bosonic fields obey canonical commutation relations, as distinct from the canonical anticommutation relations obeyed … Wikipedia
Wigner D-matrix — The Wigner D matrix is a matrix in an irreducible representation of the groups SU(2) and SO(3). The complex conjugate of the D matrix is an eigenfunction of the Hamiltonian of spherical and symmetric rigid rotors. Definition Wigner D matrix Let j … Wikipedia
Normal order — For other uses, see Normal order (disambiguation). In quantum field theory a product of quantum fields, or equivalently their creation and annihilation operators, is usually said to be normal ordered (also called Wick order) when all creation… … Wikipedia