![]() If, for example, an electron initially at rest emitted a photon, the final state The photon has to be a virtual photon, becauseĮmission of a real photon would violate energy and momentum conservation. ![]() Photons, and the interaction between the charged particles occurs when oneĬharged particle emits a virtual photon that is thenĪbsorbed by another charged particle. In quantum electrodynamics all electromagnetic fields are associated with The particles of the electromagnetic field are the In quantum field theory, forces are transmitted by particles, and fields are associated with particles which Leptons, and the force carriers for the known forces. The electromagnetic, the strong, the weak, and the gravitational force.įundamental or elementary particles are those that, as far as currentĮxperiments can tell, have no substructure. We need a mathematical model for those interactions. We need to understand the interactions (or forces) between the particles. To use quantum field theory to predict the behavior of fundamental particles, Scattering, decay, and vacuum fluctuations, but seldom to study bound states, QFT is well suited to let us calculate probabilities ofĬreation and annihilation of particles in interactions. Quantum field theory (QFT), must be used. Mechanics to particle physics, the relativistic version of quantum mechanics, Particles are neither created nor destroyed in this version. We have studied the implications of the Schroedinger equation, which isĪ fundamental equation for the non-relativistic version of quantum mechanics. Quantum Mechanics is our current model to describe how the microscopic world
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