The magnetosphere about rotating black holes surrounded by a magnetized accretion disk is expected to be largely force-free. In the recently discussed axisymmetric field-configuration of Gosh (1999), this naturally gives rise to a charge on the black hole of the order of BJ , as expected by dimensional analysis and a commensurate horizon flux of about BM. For stellar mass black holes surrounded...

We discuss whether electric charge conservation may not hold in four-dimensional world in models with infinite extra dimensions, i.e., whether escape of charged particles from our brane is consistent with effectively four-dimensional electrodynamics on the brane. We introduce a setup with photon localized on the brane and show that charge leakage into extra dimension is allowed within this setu...

We argue that magnetic and electric charges of the Reissner-Nordstrom black hole are quantized in CP conserving theories. Dequantization phenomenon occurs when CP is broken either explicitly or effectively, and, as a result, pure magnetic black holes are not possible. Two examples illustrating this phenomenon are discussed. One is the electric charge induced by the neutral pion field in a magne...

In order to investigate charge ordering phenomena under electric field, static nonequilibrium Hartree approximation (SNHA) method is formulated on the basis of the nonequilibrium Green’s functions introduced by Keldysh. By applying the SNHA to the 3/4-filling extended Hubbard model on anisotropic triangular lattice, we study the stabilities and amplitudes of 3-fold and horizontal charge orders ...

Gianluca Calcagni, João Magueijo, and David Rodríguez Fernández Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain Theoretical Physics, Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom Dipartimento di Fisica, Università La Sapienza and Sez. Roma1 INFN, Piazzale A. Moro 2, 00185 Roma, Italia Departamento de Física Teórica II, Universidad Complutens...

The geometry of the elementary charge is studied in the framework of the concept of space considered as a tessellation lattice (’tessellattice’), which has recently been developed by M. Bounias and the author. The descriptive-geometric sense of the electric and magnetic fields and their carriers – photons – is analyzed. The notion of the scalar and vector potentials of a charged particle and th...

It is shown that both the electric and magnetic dipole moment vectors of hydrogen atom in the excited states with wave function u (±) n = 1 √ 2 [R n,n−1 (r)Y n−1,±(n−2) (θϕ) ± R n,n−2 (r)Y n−2,±(n−2) (θϕ)] align themselves in the direction of an external uniform electric field which is characteristic of magneto-electric effect. These states are found to have magnetic charge g = 3n (n−2)e on acc...

We will discuss some analogies between internal gauge theories and gravity in order to better understand the charge concept in gravity. A dimensional analysis of gauge theories in general and a strict deenition of elementary, monopole, and topological charges are applied to electromagnetism and to teleparallelism, a gauge theoretical formulation of Einstein gravity. As a result we inevitably nd...

Stationary DC electric fields are determined by the resistivity distribution of the insulation materials. In the presence of interfaces between different insulation materials, charge accumulation at these boundary layers may have a significant influence on the electric field distribution and with it on the breakdown strength of the arrangement. In many previous works, surface charging of model ...