What is a particle? Keith Fratus UCSB July 17, 2012 Quantum Fields I The universe as we know it is fundamentally described by a theory of fields which interact with each other âquantum mechanicallyâ I These fields take values over all of spacetime, and can be scalars, or other ârepresentations of the Lorentz groupâ I Several authors provide good discussions of why we use quantum fields, in particu
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