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knowwhatyoudontknow
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- TL;DR Summary
- Trying to better understand Quantum Field Operators
Consider the field creation operator ψ†(x) = ∫d3p ap†exp(-ip.x)
My understanding is that this operator does not add particles from a particular momentum state. Rather it coherently (in-phase) adds a particle created from |0> expanded as a superposition of momentum eigenstates states, exp(-ip.x), at x, to a particle (if it exists) expanded as a superposition of basis states, exp(ip.x') at x'. The probability amplitude at x is then:
∫d3p exp(-ip.x)/√2π exp(ip.x')/√2π = δ(3)(x - x') which is an eigenvalue of position
Is this the correct interpretation of how things work? Sorry, if my question is a little redundant, but I am just starting out with QFT.
My understanding is that this operator does not add particles from a particular momentum state. Rather it coherently (in-phase) adds a particle created from |0> expanded as a superposition of momentum eigenstates states, exp(-ip.x), at x, to a particle (if it exists) expanded as a superposition of basis states, exp(ip.x') at x'. The probability amplitude at x is then:
∫d3p exp(-ip.x)/√2π exp(ip.x')/√2π = δ(3)(x - x') which is an eigenvalue of position
Is this the correct interpretation of how things work? Sorry, if my question is a little redundant, but I am just starting out with QFT.