Interaction between fields creates particles from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
The idea that interactions between different fields can create particles lies at the heart of quantum field theory. In the quantum theory of fields, particles are viewed as localized disturbances in the various fields that fill space. These disturbances can be thought of as quantized excitations of the fields, which manifest themselves as particles with specific properties such as mass, charge, and spin. When two fields interact with each other, they can exchange energy and momentum through the exchange of virtual particles. These virtual particles are not physical particles that can be observed directly, but rather mathematical constructs that mediate the interaction between the fields. The exchange of virtual particles can result in the creation of real particles, which can be detected experimentally. The creation of particles through interactions between fields is governed by the principles of quantum mechanics, which dictate ...
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