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131 papers · 1 filter
Photon polarization tensor in circularly polarized Hermite- and Laguerre-Gaussian beams
Felix Karbstein, Elena A. Mosman
We derive analytical expressions for the photon polarization tensor in circularly polarized Hermite- and Laguerre-Gaussian beams, complementing the corresponding results for linear…
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…
Using Machine-Learning to Optimize phase contrast in a Low-Cost Cellphone Microscope
Benedict Diederich, Rolf Wartmann, Harald Schadwinkel +1
Cellphones equipped with high-quality cameras and powerful CPUs as well as GPUs are widespread. This opens new prospects to use such existing computational and imaging resources to…
Debris Disc Constraints on Planetesimal Formation
Alexander V. Krivov, Aljoscha Ide, Torsten Löhne +2
Two basic routes for planetesimal formation have been proposed over the last few decades. One is a classical "slow-growth" scenario. Another one is particle concentration models, i…
Progress on Experiments towards LWFA-driven Transverse Gradient Undulator-Based FELs
Axel Bernhard, Veronica Afonso Rodriguez, Stephan Kuschel +9
Free Electron Lasers (FEL) are commonly regarded as the potential key application of laser wakefield accelerators (LWFA). It has been found that electron bunches exiting from state…
Low energy properties of SU(2) gauge theory with N_f = 3/2 flavours of adjoint fermions
Georg Bergner, Pietro Giudice, Istvan Montvay +3
In this work we present the results of a numerical investigation of SU(2) gauge theory with N_f = 3/2 flavours of fermions, corresponding to 3 Majorana fermions, which transform in…