Virtual particles play a role in interactions from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
In quantum field theory, the interactions between particles are described by the exchange of particles that are not observed as free particles. These particles are known as virtual particles, and they play a crucial role in mediating the forces between the particles that we do observe. Although virtual particles are not directly detectable, their effects can be seen in the interactions between observable particles. The concept of virtual particles arises from the uncertainty principle of quantum mechanics, which allows for the temporary creation of particle-antiparticle pairs out of the vacuum. These virtual particles can exist for a very short time before annihilating each other, but during their brief existence, they can influence the behavior of observable particles. When two particles interact, they can exchange virtual particles that carry momentum, energy, and other properties. These virtual pa...
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