Recently, the inverse electrodynamics model (IEM) was introduced and applied to find Reissner–Nordström black holes in context of general relativity coupled minimally with nonlinear electrodynamics. The solution consists both electric magnetic fields as dyonic solutions. Here, this note, we show that IEM belongs a more class [Formula: see text]. text] is energy momentum tensor electrodynamic La...

The characteristics of intrinsic electron and hole trapping in crystalline and amorphous Al2O3 have been studied using density functional theory (DFT). Special attention was paid to enforcing the piece-wise linearity of the total energy with respect to electron number through the use of a range separated, hybrid functional PBE0-TC-LRC (Guidon et al 2009 J. Chem. Theory Comput. 5 3010) in order ...

Light experiences a non-uniformly moving medium as an effective gravitational field, endowed with an effective metric tensor g̃μν = η μν + (n2 − 1)uμuν , n being the refractive index and uμ the fourvelocity of the medium. Leonhardt and Piwnicki [Phys. Rev. A 60, 4301 (1999)] argued that a flowing dielectric fluid of this kind can be used to generate an ’optical black hole’. In the Leonhardt-Piwn...

We present a study of the radio environment of the gamma-ray source 3EG J1828+0142. This source presents a very high variability index in its gamma emission and a steep high-energy spectral index Γ ∼ −2.8. Large-scale radio maps at different frequencies show the presence of a shell-type non-thermal structure when the diffuse emission from the Galactic disk is eliminated. At small scales, VLA ra...

Light experiences a non-uniformly moving medium as an effective gravitational field, endowed with an effective metric tensor g̃μν = η μν + (n2 − 1)uμuν , n being the refractive index and uμ the fourvelocity of the medium. Leonhardt and Piwnicki [Phys. Rev. A 60, 4301 (1999)] argued that a flowing dielectric fluid of this kind can be used to generate an ’optical black hole’. In the Leonhardt-Piwn...

We determine and characterize the full space of master equations describing dynamics perturbed Schwarzschild black holes show that all them are connected via Darboux transformations. This reveals presence a hidden symmetry, covariance, which preserves spectrum quasinormal modes continuous associated with hole scattering processes. picture is shown to share deep connection Korteweg-de Vries equa...

The drilling is well known as one of the most common hole making processes in the industry.Due to close tolerance requirement for drilled holes in the most of work pieces, onlinecontrolling of the diameter of drilled holes seems to be necessary. In the current work, an onlinedimensional controlling system was developed for drilling process. Doing this, drilling processwas executed in different ...

We consider a system of charged one-dimensional spin-$\frac{1}{2}$ fermions at low temperature. study how the energy highly-excited quasiparticle (or hole) relaxes toward chemical potential in regime weak interactions. The dominant relaxation processes involve collisions with two other fermions. find dramatic enhancement rate energies, scaling as inverse sixth power excitation energy. This beha...