On the Transition Amplitude in Quantum Electrodynamics
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概要
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A set of orthonormal states is constructed by operating (free) photon-, electron- and positron-creation operators one after another to the (free) vacuum state Ψ_0. Any state, say Ψ[σ], can be expanded in terms of these orthonormal states. An equation is derived in a covariant form which is satisfied by a coefficient of the expansion which is a function of σ and whose absolute square may be interpreted as the transition probability. The procedure may be regarded as the transition to the Fock space. In the last section, relation to the S-matrix is also discussed.
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