**Feynman diagram** — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… … Wikipedia

**Feynman diagram** — Physics. a network of lines that represents a series of emissions and absorptions of elementary particles by other elementary particles, from which the probability of the series can be calculated. Also called Feynman graph. [1965 70; named after… … Universalium

**Feynman diagram** — Feinmano diagrama statusas T sritis fizika atitikmenys: angl. Feynman diagram; Feynman graph vok. Feynman Graph, m; Feynman Diagramm, n rus. диаграмма Фейнмана, f; фейнмановская диаграмма, f pranc. diagramme de Feynman, m; graphe de Feynman, m … Fizikos terminų žodynas

**Feynman diagram** — noun Physics a diagram showing electromagnetic interactions between subatomic particles. Origin named after the American theoretical physicist Richard P. Feynman (1918–88) … English new terms dictionary

**Feynman diagram** — noun a pictorial representation of the interactions of subatomic particles, showing their paths in space and time as lines, and their interactions as points where lines meet … Wiktionary

**One-loop Feynman diagram** — In physics, a one loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic). Such a diagram can be obtained from a connected tree diagram by taking two external lines of the same type and joining them together into an… … Wikipedia

**Feynman** — may refer to: * Richard Feynman ** Feynman diagram ** Feynman graph ** Feynman Kac formula ** The Feynman Lectures on Physics ** Feynman( s) (path) integral, see Path integral formulation ** Feynman parametrization ** Feynman checkerboard **… … Wikipedia

**Feynman parametrization** — is a technique for evaluating loop integrals which arise from Feynman diagrams with one or more loops. However, it is sometimes useful in integration in areas of pure mathematics too.Richard Feynman observed that::frac{1}{AB}=int^1 0… … Wikipedia

**Feynman graph** — A Feynman graph is a graph suitable to be a Feynman diagram in a particular application of quantum field theory. (The most common use is when each field has quanta (particles) associated with it as the quantum of the electromagnetic field is a… … Wikipedia

**Feynman, Richard P.** — ▪ American physicist in full Richard Phillips Feynman born May 11, 1918, New York, New York, U.S. died February 15, 1988, Los Angeles, California American theoretical physicist who was widely regarded as the most brilliant, influential,… … Universalium