The properties of four-wave interaction via the nonlinear quantum vacuum is investigated. effect to generate photons with new frequencies and wave vectors, due elastic photon-photon scattering. An expression for number generated derived using state-of-the-art laser data it found that can reach detectable levels. In particular, prospect high repetition Astra Gemini system at Rutherford Appleton Laboratory discussed. problem noise sources reviewed, level be reduced well below signal level....

The Jeans instability is analyzed for dense magnetohydrodynamic plasmas with intrinsic magnetization, the latter due to collective electron spin effects. Furthermore, effects of tunneling as well Fermi pressure are included. It found that magnetization plasma will enhance instability, and can significantly modify structure spectra. Implications limitations our results discussed, possible generalizations.

We derive expressions for the coupling coefficients electromagnetic four-wave mixing in nonlinear quantum vacuum. An experimental setup detection of elastic photon-photon scattering is suggested, where three incoming laser pulses collide and generate a fourth wave with new frequency direction propagation. expression number scattered photons derived and, using beam parameters Astra Gemini system at Rutherford Appleton Laboratory, it found that signal can reach detectable levels. Problems...

The quantum electrodynamical (QED) short wavelength correction on plasma wave propagation for a nonrelativistic is investigated. A general dispersion relation thermal multicomponent derived. It found that the classical any mode can be modified to include and QED effects by simple substitutions of velocity frequency. Furthermore, has been strong magnetic fields. fields together with will induce both in vacuum otherwise nondispersive modes. Applications laboratory astrophysical systems are discussed.

We have considered linear kinetic theory including the electron spin properties in a magnetized plasma. The starting point is mean field Vlasov-like equation, derived from fully quantum mechanical treatment, where effects precession and magnetic dipole force taken into account. general conductivity tensor derived, both free current contribution, as well magnetization associated with contribution. conclude paper an extensive discussion of quantum-mechanical boundary we list parameter...

The experimentally observed, two-stage wear in the wet clutch friction material is directly related to temperature and engagement load. To gain insight into durability of lining, an extensive parametric analysis factors performed that takes account different groove patterns (waffle shape, radial, spiral), internal structure properties. field predicted using a thermohydrodynamic with consideration asperity contact stress during process. results should be useful facilitate industrial design...

The theory for large amplitude circularly polarized waves propagating along an external magnetic field is extended in order to also include vacuum polarization effects. A general dispersion relation, which unites previous results, derived.

A new explicit analytical form of the dispersion relation for photon propagation in presence a strong background magnetic field is derived within effective action framework. The expressed terms well-known special functions, and treatment exact linearization procedure, one-loop approximation, soft approximation. results are incorporated kinetic spin plasma description purpose studying quantum electrodynamical effects strongly magnetized plasmas. applied to astrophysical examples.

Here we consider the influence on electron spin in magnetohydrodynamic (MHD) regime. Recently developed models that include spin–velocity correlations are taken as starting point. A theoretical argument is presented, suggesting MHD regime a single-fluid model with equivalent to spin-up and spin-down electrons constituting different fluids, but where omitted. Three-wave interaction of two shear Alfvén waves compressional wave then problem evaluate asserted equivalence. The turns out be...

The effect of short wavelength quantum electrodynamic (QED) correction on plasma-wave propagation is investigated. plasma oscillations and electromagnetic waves in an unmagnetized as well a magnetized effects the QED corrections are most evident for extraordinary modes. In particular, allow to propagate, mode loses its stop band. significance our results discussed.

The effects of partial coherence on the propagation dispersive Alfven waves in a magnetoplasma are investigated. In particular, nonlinear interactions between and ion-acoustic perturbations considered by means Wigner formalism. A set governing equations consisting kinetic equation for coupled nonlinearly to ponderomotive force driven wave is obtained. used derive dispersion relation that appropriate investigating modulational instability broadband wavepackets. spectral broadening gives rise...

Current high-intensity laser sources offer a multitude of research, experiment and application possibilities, ranging from e.g. ionisation studies atomic molecular systems to particle acceleration for medical purposes. Planned upgrades existing will further increase the deliverable intensities make certain lowintensity (as compared Schwinger field) tests quantum electrodynamics viable. Moreover, secondary radiation, planned future facilities, several-orders-of-magnitude increases in...