Recently, there has been a great interest in ultrahigh "eld particle acceleration driven by ultraintense laser pulses in plasmas. Although particle acceleration by laser "elds has been proposed since the beginning of the laser evolution, there has been tremendous progress in recent years. The laser-driven particle acceleration concepts are reviewed on the physics mechanism. In particular, the e...

A network model has been developed to simulate the flow of emulsions and solid particles through porous media. Particle deposition due to direct interception, as well pore plugging by straining are accounted for in the model. The effects of two important factors-the ratio of particle size to pore size, and the fluid velocity-on particle deposition are also investigated. The strength of the mode...

Most theoretical investigations of particle acceleration during solar flares cannot be applied to observations for detailed study of the time evolution. We propose a phenomenological model for turbulence evolution and stochastic particle acceleration that links observations to the energy release and particle acceleration through two coefficients characterising particle interactions with turbule...

The paper examines the emergence of gauge fields during the evolution of a particle with a spin that is described by a matrix Hamiltonian with n different eigenvalues. It is shown that by introducing a spin gauge field a particle with a spin can be described as a spin multiplet of scalar particles situated in a non-Abelian pure gauge (forceless) field U (n). As the result, one can create a theo...

The study of the interaction a massive black hole binary with its gaseous environment is crucial in order to be able predict merger rates and possible electromagnetic counterparts gravitational wave signals. evolution semi-major axis resulting from this has been recently debated, clear consensus still missing, also because several numerical limitations, i.e. fixed orbit binaries or lack resolut...