jkb1603

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quantum-field-theory

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Does local mean infinitesimally small?

Nov 20, 2020

Trouble deriving expression for differential scattering cross section from $S$-matrix

Jan 9, 2021

How come $\frac{d}{dt}\left(\frac{\partial {r_i}}{\partial {q_j}}\right) = \frac{\partial {\dot r_i}}{\partial {q_j}}$ in Lagrangian mechanics?

Dec 11, 2018

Do "tadpole diagram with two external legs" always vanish in massless theories?

Oct 11, 2021

About the physical, measurable coupling constants, after renormalization

Jan 12, 2021

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Confusion about in and out states, interacting Hilbert space etc, referring to Weinberg QFT

Nov 10, 2021

Scattering amplitudes and LSZ formula for off-shell renormalization scheme

Sep 9, 2020

Problem with loop Integral (HQET)

Dec 13, 2018

The proton quantum state

Apr 20

Vacuum expectation value of scalar field in QFT

Apr 25, 2021

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