Upcoming and planned experiments combining increasingly intense lasers and energetic
particle beams will access new regimes of nonlinear, relativistic, quantum effects. This …

When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit
properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various …

Analytical calculations of radiative corrections in strong-field QED have hinted that in the
presence of an intense plane wave the effective coupling of the theory in the high-energy …

The current state of research on high-intensity laser fields and their interaction with charged
particles is reviewed. Data on petawatt-class laser facilities are presented, and advanced …

Vacuum birefringence is governed by the amplitude for a photon to flip helicity or
polarization state in an external field. Here, we calculate the flip and nonflip amplitudes in …

A long-standing prediction of quantum electrodynamics, yet to be experimentally observed,
is the interaction between real photons in vacuum. As a consequence of this interaction, the …

The nonlinear Breit-Wheeler process is studied in the presence of strong and short laser
pulses. We show that for a relativistically intense plane-wave laser field many features of the …

We derive a simple expression for the photon helicity and polarization-flip probabilities in
arbitrary background fields, in the low-energy regime. Taking the background to model a …

We employ the worldline formalism to derive a series representation of the low-energy limit
of the N-photon amplitude in a constant background field for both scalar and spinor QED …

By combining an adiabatic approach based on a 'locally monochromatic'approximation with
a local Hilbert transform, it is demonstrated how vacuum birefringence in the strong field …