perturbation of coordinates

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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

• 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

• Plücker coordinates — In geometry, Plücker coordinates, introduced by Julius Plücker in the 19th century, are a way to assign six homogenous coordinates to each line in projective 3 space, P 3. Because they satisfy a quadratic constraint, they establish a one to one… …   Wikipedia

• Action-angle coordinates — In classical mechanics, action angle coordinates are a set of canonical coordinates useful in solving many integrable systems. The method of action angles is useful for obtaining the frequencies of oscillatory or rotational motion without solving …   Wikipedia

• Synchronous coordinates — In general relativity, the synchronous reference system is a coordinate system in which the metric takes the form:ds^2= dt^2+h {ab}dx^adx^b,where the Latin indices a and b are summed over the spatial directions and h {ab} is a spatial metric. Any …   Wikipedia

• BKL singularity — A BKL (Belinsky Khalatnikov Lifshitz) singularityHarvnb|Belinsky|Khalatnikov|Lifshitz|1970] is a model of the dynamic evolution of the Universe near the initial singularity, described by a non symmetric, chaotic, vacuum solution to Einstein s… …   Wikipedia

• Laplace–Runge–Lenz vector — Throughout this article, vectors and their magnitudes are indicated by boldface and italic type, respectively; for example, left| mathbf{A} ight| = A. In classical mechanics, the Laplace–Runge–Lenz vector (or simply the LRL vector) is a vector… …   Wikipedia

• Hamilton's principle — In physics, Hamilton s principle is William Rowan Hamilton s formulation of the principle of stationary action (see that article for historical formulations). It states that the dynamics of a physical system is determined by a variational problem …   Wikipedia

• Orbit — This article is about orbits in celestial mechanics, due to gravity. For other uses, see Orbit (disambiguation). A satellite orbiting the Earth has a tangential velocity and an inward acceleration …   Wikipedia

• Metamaterial cloaking — Electromagnetism Electricity · …   Wikipedia

• Vecteur de Runge-Lenz — Dans cet article les vecteurs et leurs normes sont indiqués respectivement en gras et italique. Par exemple : . En mécanique classique, le vecteur de Runge Lenz ou invariant de Runge Lenz est un vecteur utilisé principalement pour décrire la …   Wikipédia en Français