Tag Archive for: S-matrix

Virtual Particles Explained: On-Shell vs Off-Shell in QFT
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What Is a Virtual Particle?
A virtual particle is a mathematical device, not a physical entity, that appears in perturbation expansions of the S-operator…

Learn Interacting Quantum Fields in Mathematical Quantum Field Theory
This is one chapter in a series on Mathematical Quantum Field Theory.The previous chapter is 14. Free quantum fields.The next chapter is 16. Renormalization.
15.…
