Quantum Field Theory (QFT) is a fundamental framework in theoretical physics that combines classical field theory, special relativity, and quantum mechanics. It provides a rigorous foundation for understanding the behavior of elementary particles and their interactions. Here are its key components in a nutshell: 1. **Fields as Fundamental Entities**: In QFT, particles are viewed as excitations or quanta of underlying fields that permeate space and time. Each type of particle (e.g.
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