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Lines that stand for an integral.
Also known as: Feynman graph, Particle interaction diagram
The physics notation representing a term in a perturbative expansion as a diagram of lines and vertices.
Represents a term in a perturbative calculation as a diagram whose lines and vertices correspond to factors in an integral.
Contexts: Mathematics, Technical drawing
Each diagram is a bookkeeping device for a specific mathematical expression, not a picture of particles moving: the lines have no trajectory and the vertices no location, which is the misreading the notation most often invites.
Contexts: Mathematics, Technical drawing
The line styles are conventional rather than standardised, so a wavy line means a photon in one paper and something else in another unless the caption says.
Line-style conventions vary between authors and subfields.
Contexts: Mathematics, Technical drawing
Straight lines with arrows for fermions, wavy lines for photons and coiled lines for gluons, meeting at vertices, with time running along one axis by convention.