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Path integral calculation of heat kernel traces with first order operator insertions
Fiorenzo Bastianelli, Francesco Comberiati
We study generalized heat kernel coefficients, which appear in the trace of the heat kernel with an insertion of a first-order differential operator, by using a path integral repre…
Worldline master formulas for the dressed electron propagator, part 1: Off-shell amplitudes
Naser Ahmadiniaz, Victor Miguel Banda Guzman, Fiorenzo Bastianelli +3
In the first-quantised worldline approach to quantum field theory, a long-standing problem has been to extend this formalism to amplitudes involving open fermion lines while mainta…
Reducible contributions to the propagator and EHL in background fields
N. Ahmadiniaz, F. Bastianelli, O. Corradini +2
We briefly discuss the recent discovery of reducible contributions to QED effective actions due to the presence of external electromagnetic fields at tree level and higher loop-ord…