NTNU Trondheim, Institutt for fysikk

Draw all Feynman diagrams and write down the matrix element M f i of this process at lowest order perturbation theory.. Show that the matrix element is gauge invariant only when

We can always find a normal coordinate system at the position of the electron that is locally Minkowskian, transforming gravity away: no gravity, no acceleration, no emitted

We can always find a normal coordinate system at the position of the electron that is locally Minkowskian, transforming gravity away: no gravity, no acceleration, no emitted

(6 pts) c.) Draw the Feynman diagrams for φφ → φφ scattering at O (λ 2 ), determine the symmetry factor of these diagrams, and write down the expression for the Feynman amplitude i

g.) Draw the primitive divergent diagrams in this theory and determine their superficial degree of divergence.. the relative sign is fixed by the relativistic energy-momentum

Feynman rules and some formulas can be found on p.. two out of four degrees of freedom in A µ are unphysical. The six additional unphysical d.o.f. , ¯ c 3 ) compensate now

In this case, we can integrate and obtain a global conservation law in general only, if T µ···σ is completely anti-symmetric (i.e. For a symmetric tensor as the energy-momentum

a and b. Scalar QED has two coupling constants. “Loop diagrams in lowest order perturbation theory” means all diagrams containing one loop. The full number of points was already