Feynman diagram

Definition

A Feynman diagram is a graphical representation of the interactions between particles, illustrating the paths taken by particles and their interactions via force-carrying particles. These diagrams simplify complex mathematical calculations in quantum field theory.

5 Must Know Facts For Your Next Test

1. Feynman diagrams were introduced by physicist Richard Feynman in the 1940s.
2. Each line in a Feynman diagram represents a particle, with straight lines typically representing fermions and wavy or curly lines representing bosons.
3. Vertices in the diagram indicate points where particles interact or decay, adhering to conservation laws like energy and momentum.
4. Feynman diagrams can be used to calculate probabilities of particle interactions and decays using rules known as Feynman rules.
5. The direction of time is usually depicted from left to right or bottom to top in these diagrams.

Related terms

Quantum Field Theory:

A theoretical framework that combines classical field theory, special relativity, and quantum mechanics to describe fundamental forces and elementary particles.

Vertex: A point in a Feynman diagram where two or more particle lines meet, indicating an interaction or decay event.

Propagator: $Mathematical function that describes the probability amplitude for a particle to travel from one point to another$.