# propagator

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**propagator**— noun (C) 1 someone who spreads ideas, beliefs etc 2 a covered box of soil in which seeds are planted to grow quickly …22

**propagator**— prop·a·ga·tor …23

**Propagator**— Pro|pa|ga|tor, der; s, ...oren (jemand, der etwas propagiert) …24

**propagator**— n. 1 a person or thing that propagates. 2 a small box that can be heated, used for germinating seeds or raising seedlings …25

**Heated propagator**— A Heated Propagator is a horticultural device to maintain a warm and damp environment for seeds and cuttings to grow in. This can be in the form of a clear enclosed bin sitting over a hotpad, or even a portable heater pointed at the bin. the key… …26

**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… …27

**On shell renormalization scheme**— In quantum field theory, and especially in quantum electrodynamics, the interacting theory leads to infinite quantities that have to be absorbed in a renormalization procedure, in order to be able to predict measurable quantities. The… …28

**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… …29

**Green's function (many-body theory)**— In many body theory, the term Green s function (or Green function) is sometimes used interchangeably with correlation function, but refers specifically to correlators of field operators or creation and annihilation operators.The name comes from… …30

**Mass gap**— Quantum field theory (Feynman diagram) …