8 citations · 18 across the 6 of their papers we have counts for
7 papers · 1 filter
Scattering in strong field QED in a non-null background
Patrick Copinger, James P. Edwards, Karthik Rajeev
We examine scattering amplitudes for an arbitrary number of photons in a class of non-null background electromagnetic fields, studying tree-level and one-loop amplitudes in scalar…
In-in worldline formalism in pair creating fields
Patrick Copinger, Shi Pu
An in-in framework under Schwinger pair creating fields in strong-field quantum electrodynamics is formulated using in-out propagators in coordinate space, that have first-quantize…
Low-energy multi-photon scattering at tree-level and one-loop order in a homogeneous electromagnetic field
Ivan Ahumada, Patrick Copinger, James P. Edwards
We study low energy photons coupled to scalar and spinor matter in the presence of an arbitrary homogeneous electromagnetic field in a first-quantised (worldline) approach. Utilisi…
All-multiplicity amplitudes in impulsive PP-waves from the worldline formalism
Patrick Copinger, James P. Edwards, Anton Ilderton +1
We use the worldline formalism to derive Bern-Kosower type Master Formulae for the tree-level scattering of a charged particle and an arbitrary number of photons on impulsive PP-wa…
Master Formulae for -photon tree level amplitudes in plane wave backgrounds
Patrick Copinger, James P. Edwards, Anton Ilderton +1
The presence of strong electromagnetic fields adds huge complexity to QED Feynman diagrams, such that new methods are required to calculate higher-loop and higher-multiplicity scat…
Schwinger Pair Production in SL Topologically Non-Trivial Fields via Non-Abelian Worldline Instantons
Patrick Copinger, Pablo Morales
Schwinger pair production is analyzed in a BPST instanton background and in its SL complex extension for complex scalar particles. A non-Abelian extension of the wo…