The fields of rapidly moving sources are studied within nonlinear electrodynamics by boosting the fields of sources at rest. As a consequence of the ultrarelativistic limit the δ–like electromagnetic shock waves are found. The character of the field within the shock depends on the theory of nonlinear electrodynamics considered. In particular, we obtain the field of an ultrarelativistic charge i...

Introduction/purpose: The problem of divergencies in Quantum Electrodynamics (QED) is discussed. Methods: renormalisation group method employed for dealing with infinities QED. Results: integrals QED giving physical observables are finite. Conclusions: can be treated a consistent way providing mathematical rigorous results.

It is shown how point charges and point dipoles with finite self-energies can be accomodated into classical electrodynamics. The key idea is the introduction of constitutive relations for the electromagnetic vacuum, which actually mirrors the physical reality of vacuum polarization. Our results reduce to conventional electrodynamics for scales large compared to the classical electron radius r0 ...

It is proved that in classical electrodynamics the uniform rectilinear motion of charged " rigid " sphere with self-action (Sommerfeld model) is stable. 03.50.De In classical electrodynamics long time ago in Sommerfeld works [1, see also 2] was derived the expression of self-force acting on " nonrelativistically rigid charged sphere " , i.e sphere with radius a, its center moving along trajecto...

In the framework of the operator product expansion I provide a detailed evaluation of the contribution of the lowest photon condensate to the two-point photon Green function for four-dimensional spinor electrodynamics and three-dimensional scalar electrodynamics. Since the above mentioned condensate affects the part of the propagator contributing to physical amplitudes I suggest that this conde...

Photon correlation measurements reveal the response of the conditional evolution of the cavity QED system to a novel quantum feedback protocol. A photodetection collapses the state of the system and triggers a feedback pulse with an adjustable delay and amplitude that alters the intensity driving the system. The conditional evolution of the system freezes into a new steady state where it reside...

A generalization of the classical electrodynamics for systems in absolute motion is presented using a possible alternative to the Lorentz transformation. The main hypothesis assumed in this work are: a) The inertial transformations relate two inertial frames: the privileged frame S and the moving frame S′ with velocity v with respect to S. b) The transformation of the fields from S to the movin...