414 citations · 1.9k across the 43 of their papers we have counts for
29 papers · 1 filter
Solving the Dirac equation on a GPU for strong-field processes in multidimensional background fields
Greger Torgrimsson
In this paper, we show how to solve the Dirac equation, , on a GPU. This is orders of magnitude faster than solving it on CPU and allows u…
Momentum correlation in pair production by spacetime dependent fields from scattered wave functions
Greger Torgrimsson
We consider Sauter-Schwinger pair production by electric fields that depend on both time and space, and . For space-independent fields, , momentum conserva…
Nonlinear trident using WKB and worldline instantons
Gianluca Degli Esposti, Greger Torgrimsson
We consider nonlinear trident, , in various electric background fields. This…
Schwinger pair production in spacetime fields: Moiré patterns, Aharonov-Bohm phases and Sturm-Liouville eigenvalues
Gianluca Degli Esposti, Greger Torgrimsson
We use a worldline-instanton formalism to study the momentum spectrum of Schwinger pair production in spacetime fields with multiple stationary points. We show that the interferenc…
Quantum radiation reaction: Analytical approximations and obtaining the spectrum from moments
Greger Torgrimsson
We derive analytical approximations for spin-dependent quantum radiation reaction for locally constant and locally monochromatic fields. We show how to factor out fast spin…
Momentum spectrum of nonlinear Breit-Wheeler pair production in space-time fields
Gianluca Degli Esposti, Greger Torgrimsson
We show how to use a worldline-instanton formalism to calculate, to leading order in the weak-field expansion, the momentum spectrum of nonlinear Breit-Wheeler pair production in f…
Quantum radiation reaction spectrum of electrons in plane waves
Greger Torgrimsson
In previous works we derived equations for the average momentum of high-energy electrons experiencing quantum radiation reaction (RR) in strong electromagnetic plane-wave backgroun…
Momentum spectrum of Schwinger pair production in four-dimensional e-dipole fields
Gianluca Degli Esposti, Greger Torgrimsson
We calculate the momentum spectrum of electron-positron pairs created via the Schwinger mechanism by a class of four-dimensional electromagnetic fields called e-dipole fields. To t…
Worldline instantons for the momentum spectrum of Schwinger pair production in space-time dependent fields
Gianluca Degli Esposti, Greger Torgrimsson
We show how to use the worldline-instanton formalism to calculate the momentum spectrum of the electron-positron pairs produced by an electric field that depends on both space and…
Resummation of the expansion for nonlinear pair production
Greger Torgrimsson
We show how to resum the Furry-picture expansion in order to take quantum radiation reaction and spin transition into account in the nonlinear trident process in (pulsed) plane…
Advances in QED with intense background fields
A. Fedotov, A. Ilderton, F. Karbstein +4
Upcoming and planned experiments combining increasingly intense lasers and energetic particle beams will access new regimes of nonlinear, relativistic, quantum effects. This improv…
Worldline instantons for nonlinear Breit-Wheeler pair production and Compton scattering
Gianluca Degli Esposti, Greger Torgrimsson
Worldline instantons have previously been used to study the probability of Schwinger pair production (both the exponential and pre-exponential parts) and photon-stimulated pair pro…
Resummation of quantum radiation reaction and induced polarization
Greger Torgrimsson
In a previous paper we proposed a new method based on resummations for studying radiation reaction of an electron in a plane-wave electromagnetic field. In this paper we use this m…
Resummation of quantum radiation reaction in plane waves
Greger Torgrimsson
We propose a new approach to obtain the momentum expectation value of an electron in a high-intensity laser, including multiple photon emissions and loops. We find a recursive form…
Loops and polarization in strong-field QED
Greger Torgrimsson
In a previous paper we showed how higher-order strong-field-QED processes in long laser pulses can be approximated by multiplying sequences of "strong-field Mueller matrices". We o…
Nonlinear photon trident versus double Compton scattering and resummation of one-step terms
Greger Torgrimsson
We study the photon trident process, where an initial photon turns into an electron-positron pair and a final photon under a nonlinear interaction with a strong plane-wave backgrou…
Nonlinear trident in the high-energy limit: Nonlocality, Coulomb field and resummations
Greger Torgrimsson
We study nonlinear trident in laser pulses in the high-energy limit, where the initial electron experiences, in its rest frame, an electromagnetic field strength above Schwinger's…
The trident process in laser pulses
Victor Dinu, Greger Torgrimsson
We study the trident process in laser pulses. We provide exact numerical results for all contributions, including the difficult exchange term. We show that all terms are in general…
Approximating higher-order nonlinear QED processes with first-order building blocks
Victor Dinu, Greger Torgrimsson
Higher-order tree-level processes in strong laser fields, i.e. cascades, are in general extremely difficult to calculate, but in some regimes the dominant contribution comes from a…
Thermally versus dynamically assisted Schwinger pair production
Greger Torgrimsson
We study electron-positron pair production by the combination of a strong, constant electric field and a thermal background. We show that this process is similar to dynamically ass…
Perturbative methods for assisted nonperturbative pair production
Greger Torgrimsson
In the dynamically assisted Schwinger mechanism, the pair production probability is significantly enhanced by including a weak, rapidly varying field in addition to a strong, slowl…
Single and double nonlinear Compton scattering
Victor Dinu, Greger Torgrimsson
We study single, double and higher-order nonlinear Compton scattering where an electron interacts nonlinearly with a high-intensity laser and emits one, two or more photons. We stu…
Sauter-Schwinger pair creation dynamically assisted by a plane wave
Greger Torgrimsson, Christian Schneider, Ralf Schützhold
We study electron-positron pair creation by a strong and constant electric field superimposed with a weaker transversal plane wave which is incident perpendicularly (or under some…
Trident pair production in plane waves: Coherence, exchange, and spacetime inhomogeneity
Victor Dinu, Greger Torgrimsson
We study the trident process in inhomogeneous plane wave background fields. We obtain compact analytical expressions for all terms in the probability, including the exchange part,…