414 citations · 1.9k across the 43 of their papers we have counts for
11 papers · 1 filter
Worldline instantons for nonperturbative particle production by space and time dependent gravitational fields
Philip Semrén, Greger Torgrimsson
We develop a worldline-instanton approach for calculating the momentum spectrum of particles produced by gravitational fields which depend on both space and time. The instantons ar…
Discrete worldline instantons
Christian Schneider, Greger Torgrimsson, Ralf Schützhold
The semiclassical approximation of the worldline path integral is a powerful tool to study nonperturbative electron-positron pair creation in spacetime-dependent background fields.…
Dynamically assisted Sauter-Schwinger effect - non-perturbative versus perturbative aspects
Greger Torgrimsson, Christian Schneider, Johannes Oertel +1
The Sauter-Schwinger effect predicts the creation of electron-positron pairs out of the quantum vacuum by a strong and slowly varying electric field. This effect can be dynamically…
Critical Schwinger pair production II - universality in the deeply critical regime
Holger Gies, Greger Torgrimsson
We study electron-positron pair production by spatially inhomogeneous electric fields. Depending on the localization of the field, a critical point (critical surface) exists in the…
Doubly assisted Sauter-Schwinger effect
Greger Torgrimsson, Johannes Oertel, Ralf Schützhold
We study electron-positron pair creation by a strong and slowly varying electric field, assisted by a weaker and more rapidly changing field (e.g., in the keV regime) plus an addit…
The worldline approach to helicity flip in plane waves
Anton Ilderton, Greger Torgrimsson
We apply worldline methods to the study of vacuum polarisation effects in plane wave backgrounds, in both scalar and spinor QED. We calculate helicity-flip probabilities to one loo…
Nonperturbative pair production in interpolating fields
Anton Ilderton, Greger Torgrimsson, Jonatan Wårdh
We compare the effects of timelike, lightlike and spacelike one-dimensional inhomogeneities on the probability of nonperturbative pair production in strong fields. Using interpolat…
Pair production from residues of complex worldline instantons
Anton Ilderton, Greger Torgrimsson, Jonatan Wårdh
We study nonperturbative pair production in electric fields with lightlike inhomogeneities, using complex worldline instantons. We show that the instanton contribution to the pair…
Radiation reaction from QED: lightfront perturbation theory in a plane wave background
Anton Ilderton, Greger Torgrimsson
We derive dynamical, real time radiation reaction effects from lightfront QED. Combining the Hamiltonian formalism with a plane wave background field, the calculation is performed…
Radiation reaction in strong field QED
Anton Ilderton, Greger Torgrimsson
We derive radiation reaction from QED in a strong background field. We identify, in general, the diagrams and processes contributing to recoil effects in the average momentum of a…
Scattering in plane-wave backgrounds: infra-red effects and pole structure
Anton Ilderton, Greger Torgrimsson
We consider two aspects of scattering in strong plane wave backgrounds. First, we show that the infra-red divergences in elastic scattering depend on the structure of the backgroun…