The relativistic expressions for the anti-hermitian (damping) parts of the dielectric tensor elements can be expressed as a single integral over the parallel momentum variable (see Eq.(1) below). A computer program has been written for the calculation of this single integral [1]. The numerical results are tested for a relativistic Maxwellian distribution and agree with analytical expressions de...

The effect of the relativistic spin rotation, conditioned by the setting of the spin in the rest frame of a particle and by the noncommutativity of the Lorentz transformations along noncolinear directions, is discussed. In connection with this, the Thomas precession of the spin polarization vector at the motion of a particle along a curvilinear trajectory is considered. The transformations of t...

We investigate the first example of self-consistent impact ionization fronts propagating at relativistic speeds and involving interacting, high-energy electrons. These fronts, which we name relativistic runaway ionization fronts, show remarkable features such as a bulk speed within less than one percent of the speed of light and the stochastic selection of high-energy electrons for further acce...

We discuss the bulk viscosity of hot and dense $npe\mu$ matter arising from weak-interaction direct Urca processes. consider two regimes interest: (a) neutrino-transparent regime with $T\leq T_{\rm tr}$ ($T_{\rm tr}\simeq 5\div 10$ MeV is neutrino-trapping temperature); (b) neutrino-trapped $T\geq tr}$. Nuclear modeled in relativistic density functional approach density-dependent parametrizatio...

Abstract We present the relativistic hydrostatic equilibrium equations for a wide class of gravitational theories possessing scalar–tensor representation. It turns out that stellar structure can be written with respect to invariants, allowing interpret their physical role.

This thesis is devoted to studying two important aspects of braneworld physics: their cosmology and their holography. We examine the Einstein equations induced on a general (n − 2)-brane of arbitrary tension, embedded in some n-dimensional bulk. The brane energy-momentum tensor enters these equations both linearly and quadratically. From the point of view of a homogeneous and isotropic brane we...

The weakness of X-ray reflection in Cyg X-1 is suggested to be due to vertical motion of the emitting plasma in the active corona of an accretion disk. A mildly relativistic bulk motion causes a reduction of X-ray emission towards the disk which reflects/reprocesses the incident X-rays. The observed slope of the X-ray spectrum and the amount of reflection can both be explained if the flaring pl...