Secular terms in Dyson series to all orders of perturbation

a cross-comparative dtudy between two textbook series in terms of the presentation of politeness

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On Perturbation Theory, Dyson Series, and Feynman Diagrams

On Perturbation Theory, Dyson Series, and Feynman Diagrams

To study the transitions (scattering, making new particles, decays, etc.) caused by V̂ we want to use a fixed basis of Ĥ0 eigenstates, but we want to keep the transitions separate from wave-packet spreading and other effects due to Schrödinger phases e−iEt of the Ĥ0 itself. The picture of QM which separates these effects is the interaction picture. In the Schrödinger picture, the operators are t...

a synchronic and diachronic approach to the change route of address terms in the two recent centuries of persian language

terms of address as an important linguistics items provide valuable information about the interlocutors, their relationship and their circumstances. this study was done to investigate the change route of persian address terms in the two recent centuries including three historical periods of qajar, pahlavi and after the islamic revolution. data were extracted from a corpus consisting 24 novels w...

Supertranslations to all orders

The transformation laws of the general linear superfield V (x, θ, θ) and chiral superfields under N = 1 supertranslations exp[i(ζ ·Q+Q · ζ)] are tabulated to all orders in the parameters ζ , ζ.