We extend the formulation for perturbations of maximally symmetric black holes in higher dimensions developed by the present authors in a previous paper to a charged black hole background whose horizon is described by an Einstein manifold. For charged black holes, perturbations of electromagnetic fields are coupled to the vector and scalar modes of metric perturbations non-trivially. We show th...

We extend the formulation for perturbations of maximally symmetric black holes in higher dimensions developed in our previous paper to a charged black hole background whose horizon is described by an Einstein manifold. For charged black holes, perturbations of electromagnetic fields are coupled to the vector and the scalar modes of metric perturbations non-trivially. We show that by taking appr...

The emission of electromagnetic radiation from charged particles spiraling around magnetic fields is an important effect in astrophysical and laboratory plasmas. In theoretical modeling, issues still not fully resolved are, among others, the inclusion of the recoil force on the relativistic electron motion and the detailed computation of the radiation power spectrum. In this paper, the cyclotro...

This paper presents a new theory of radiation and propagation of electromagnetic (EM) waves: EM waves caused by the same cause will never cross each other. It discloses a fundamental mistake in the established assumptions and method of analysis of radiation and propagation problems of electromagnetic waves and application of superposition principle. It implies invalidation of the established so...

We study the dynamics of relativistic electromagnetic explosions as a possible mechanism for the production of Gamma-Ray Bursts. We propose that a rotating relativistic stellar-mass progenitor loses much of its spin energy in the form of an electromagnetically-dominated outflow. After the flow becomes optically thin, it forms a relativistically expanding, non-spherically symmetric magnetic bubb...

Electromagnetic wave emission based on optical rectification at terahertz (THz) wavelengths was observed from surface-immobilized gold nanospheres (SIGNs) above a gold surface. Although the excitation wavelength is off-resonant with the localized surface plasmons, the THz emission field was observed to be approximately 4.8 times greater than that from a percolated gold thin film of 10 nm thickn...

We have proposed a novel three-dimensional (3D) photonic crystal laser. The electromagnetic field, radiation power density, and lifetime of spontaneous emission of the laser were calculated by a plane-wave method. When a defect layer is introduced into the crystal, spontaneous emission radiates only in the lasing direction. The radiation angle is as sharp as that of a conventional surface-emitt...