Renormalization is essential for accurate calculations from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
Renormalization is an essential part of quantum field theory, allowing us to make accurate predictions about the behavior of particles and their interactions. It is a technique that allows us to deal with infinities that arise in calculations due to the quantum nature of fields. In quantum field theory, interactions between particles are described by Feynman diagrams, which represent all possible ways in which particles can interact. These diagrams involve integrals over momentum variables, which can lead to divergent results. Renormalization helps us tackle these infinities by introducing counterterms that cancel out the divergent contributions. Without renormalization, our calculations would be plagued by infinities that would render our predictions meaningles...
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