Particles and Fields
In the previous chapter we discussed classical relativistic point particles. Physical particles must of course obey the rules of quantum mechanics. The appropriate formalism for describing the quantum behavior of elementary particles is the quantum field theory founded by Dirac, Jordan, Pauli, and Heisenberg (Dirac 1927; Jordan 1928; Heisenberg 1929,1930). An important feature of this theory is that it unites wave- and particle-like aspects. For example, quantum field theory can describe both the propagation of a light wave and the photoelectric effect.
KeywordsState Vector Lagrange Density Lagrange Formalism Creation Operator Null Vector
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