propagator
propagator (n)
- plural
- propagators
English Definitions:
propagator (noun)
someone who propagates plants (as under glass)
propagator, disseminator (noun)
someone who spreads the news
propagator (Noun)
A person who disseminates news or rumour
propagator (Noun)
A person who propagates plants
propagator (Noun)
A covered, sometimes heated container for germinating seeds or raising seedlings
propagator (Noun)
A function that represents the quantum propagation of a subatomic particle
Propagator
In quantum mechanics and quantum field theory, the propagator gives the probability amplitude for a particle to travel from one place to another in a given time, or to travel with a certain energy and momentum. Propagators are used to represent the contribution of virtual particles on the internal lines of Feynman diagrams. They also can be viewed as the inverse of the wave operator appropriate to the particle, and are therefore often called Green's functions.
Propagator
In quantum mechanics and quantum field theory, the propagator is a function that specifies the probability amplitude for a particle to travel from one place to another in a given period of time, or to travel with a certain energy and momentum. In Feynman diagrams, which serve to calculate the rate of collisions in quantum field theory, virtual particles contribute their propagator to the rate of the scattering event described by the respective diagram. These may also be viewed as the inverse of the wave operator appropriate to the particle, and are, therefore, often called (causal) Green's functions (called "causal" to distinguish it from the elliptic Laplacian Green's function).
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