Speaker
Patrick Copinger
(University of Plymouth)
Description
An $N-$photon dressed propagator in (s)QED at tree level and effective action to one-loop in an arbitrary homogeneous electromagnetic field are examined in a photon low-energy limit. On the line, in a Fock-Schwinger gauge for the $N-$photons, it is discussed how the photons resemble a superposition of homogeneous fields, in addition to the background field. On the loop and on the line, in both coordinate and momentum representations, an expansion of the photons is demonstrated in terms of worldline Green functions in a background homogeneous field. We further discuss a recursion relation to treat the expansion, complimentary to the Green function approach.
Author
Patrick Copinger
(University of Plymouth)
Co-authors
Ivan Ahumada
(University of Plymouth)
James Edwards
(University of Plymouth)
