oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Thermal Quantum Fields in Static Electromagnetic Backgrounds  [PDF]
A. A. Actor,K. D. Rothe
Physics , 2000, DOI: 10.1088/0305-4470/33/25/302
Abstract: We present and discuss, at a general level, new mathematical results on the spatial nonuniformity of thermal quantum fields coupled minimally to static background electromagnetic potentials. Two distinct examples are worked through in some detail: uniform (parallel and perpendicular) background electric and magnetic fields coupled to a thermal quantum scalar field.
Strong gravitational force induced by static electromagnetic fields  [PDF]
B. V. Ivanov
Physics , 2004,
Abstract: It is argued that static electric or magnetic fields induce Weyl-Majumdar-Papapetrou solutions for the metric of spacetime. Their gravitational acceleration includes a term many orders of magnitude stronger than usual perturbative terms. It gives rise to a number of effects, which can be detected experimentally. Four electrostatic and four magnetostatic examples of physical set-ups with simple symmetries are proposed. The different ways in which mass sources enter and complicate the pure electromagnetic picture are described.
On the screening of static electromagnetic fields in hot QED plasmas  [PDF]
Jean-Paul Blaizot,Edmond Iancu,Rajesh R. Parwani
Physics , 1995, DOI: 10.1103/PhysRevD.52.2543
Abstract: We study the screening of static magnetic and electric fields in massless quantum electrodynamics (QED) and massless scalar electrodynamics (SQED) at temperature $T$. Various exact relations for the static polarisation tensor are first reviewed and then verified perturbatively to fifth order (in the coupling) in QED and fourth order in SQED, using different resummation techniques. The magnetic and electric screening masses squared, as defined through the pole of the static propagators, are also calculated to fifth order in QED and fourth order in SQED, and their gauge-independence and renormalisation-group invariance is checked. Finally, we provide arguments for the vanishing of the magnetic mass to all orders in perturbation theory.
Quasi-static electromagnetic fields created by an electric dipole in the vicinity of a dielectric sphere: method of images
Zurita-Sánchez, Jorge R.;
Revista mexicana de física , 2009,
Abstract: we present a quasi-static description of the electromagnetic fields created by an oscillating electric dipole in the vicinity of a dielectric sphere. in this description: the fields are generated by image sources, a simple physical picture of the electromagnetic response of the dipole nearby a dielectric sphere is obtained, and the nearfields are calculated from the green tensor of a bulk medium. this quasi-static description can be applied to study radiative properties of emitters (molecules, atoms, etc.) placed in the vicinity of a dielectric spherical nanoparticle.
Scalar and electromagnetic fields of static sources in higher dimensional Majumdar-Papapetrou spacetimes  [PDF]
Valeri Frolov,Andrei Zelnikov
Physics , 2012, DOI: 10.1103/PhysRevD.85.064032
Abstract: We study scalar massless and electromagnetic fields from static sources in a static higher dimensional spacetime. Exact expressions for static Green's functions for such problems are obtained in the background of the Majumdar-Papapetrou solutions of the Einstein-Maxwell equations. Using this result we calculated the force between two scalar or electric charges in the presence of one or several extremely charged black holes in equilibrium in the higher dimensional spacetime.
Intense Electron Beams Formation and Analysis Methods in Static Electromagnetic Fields (Review)  [PDF]
G.S. Vorobyov,I.V. Barsuk,А.А. Drozdenko
Journal of Nano- and Electronic Physics , 2011,
Abstract: In this review basic principles of electron beams formation in static electric and magnetic fields are reported. Traditional and new perspective designs of electron-optical systems and magnetic systems are also considered. Questions of charged-particle beam focusing and transport on the level of modern technologies are being analyzed and their theoretic and experimental parameter research methods are examined as well.
Non-minimal $R^βF^2$-Coupled Electromagnetic Fields to Gravity and Static, Spherically Symmetric Solutions  [PDF]
Tekin Dereli,?zcan Sert
Physics , 2011, DOI: 10.1142/S0217732311036085
Abstract: We investigate non-minimal $R^\beta F^2$-type couplings of electromagnetic fields to gravity. We derive the field equations by a first order variational principle using the method of Lagrange multipliers. Then we present various static, spherically symmetric solutions describing the exterior fields in the vicinity of electrically charged massive bodies.
Non-minimal $\ln(R)F^2$ Couplings of Electromagnetic Fields to Gravity: Static, Spherically Symmetric Solutions  [PDF]
Tekin Dereli,?zcan Sert
Physics , 2011, DOI: 10.1140/epjc/s10052-011-1589-2
Abstract: We investigate the non-minimal couplings between the electromagnetic fields and gravity through the natural logarithm of the curvature scalar. After we give the Lagrangian formulation of the non-minimally coupled theory, we derive field equations by a first order variational principle using the method of Lagrange multipliers. We look at static, spherically symmetric solutions that are asymptotically flat. We discuss the nature of horizons for some candidate black hole solutions according to various values of the parameters $R_0 $ and $a_1$.
Static and 50 Hz Electromagnetic Fields Effects on Human Neuronal-Like Cells Vibration Bands in the Mid-Infrared Region  [PDF]
Emanuele Calabrò, Salvatore Condello, Salvatore Magazù, Riccardo Ientile
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.32012
Abstract: Human neuronal-like cells were exposed to static and 50 Hz electromagnetic fields at the intensities of 2 mT and 1 mT, respectively. The effects of exposure were investigated in the mid-infrared region by means of Fourier self deconvolu-tion spectroscopic analysis. After exposure of 3 hours to static and 50 Hz electromagnetic fields, the vibration bands of CH2 methilene group increased significantly after both exposures, suggesting a relative increase of lipid related to conformational changes in the cell membrane due to electromagnetic fields. In addition, PO2- stretching phosphate bands decreased after both exposures, suggesting that alteration in DNA/RNA can be occurred. In particular, exposure of 3 hours to 50 Hz electromagnetic fields produced significant increases in β-sheet contents in amide I, and around the 1740 cm?1 band assigned to non-hydrogen-bonded ester carbonyl stretching mode, that can be related to unfolding processes of proteins structure and cells death. Further exposure up to 18 hours to static magnetic field produced an increase in β-sheet contents as to α-helix components of amide I region, as well.
The electromagnetic momentum of static charge-current distributions  [PDF]
Jerrold Franklin
Physics , 2013, DOI: 10.1119/1.4879539
Abstract: The origin of electromagnetic momentum for general static charge-current distributions is examined. The electromagnetic momentum for static electromagnetic fields is derived by implementing conservation of momentum for the sum of mechanical momentum and electromagnetic momentum. The external force required to keep matter at rest during the production of the final static configuration produces the electromagnetic momentum. Examples of the electromagnetic momentum in static electric and magnetic fields are given. The `center of energy' theorem is shown to be violated by electromagnetic momentum. `Hidden momentum' is shown to be generally absent, and not to cancel electromagnetic momentum.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.