- #1
naima
Gold Member
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I read in this paper[/PLAIN]
"Unfortunately, the derivation of the Dyson series perturbation expansion relies on the use of the interaction picture, in which the interacting field is unitarily equivalent to the free field"
It may be obvious but could you tell me where this equivalence to the free field appears in
interaction picture
"Unfortunately, the derivation of the Dyson series perturbation expansion relies on the use of the interaction picture, in which the interacting field is unitarily equivalent to the free field"
It may be obvious but could you tell me where this equivalence to the free field appears in
interaction picture
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