Classical energy emission by a point dipole

1986 ◽  
Vol 64 (5) ◽  
pp. 551-552 ◽  
Author(s):  
G. McKeon ◽  
B. Shadwick
Keyword(s):  
Dipole Moment ◽  
Emission Rate ◽  
Point Particle ◽  
Point Dipole ◽  
Energy Emission ◽  
Classical Energy ◽  
Spacelike Vector

The classical Larmor formula [Formula: see text] for the energy-emission rate R of a point particle with charge e moving with acceleration aλ is extended to include the energy-emission rate of a point dipole whose dipole moment is characterized by a spacelike vector sα.

Inverse problem of the field of a charge and point dipole moment

1999 ◽  
Vol 42 (7) ◽  
pp. 587-591 ◽  
Author(s):  
T. G. Mitrofanova ◽  
V. Ya. Épp
Keyword(s):  
Inverse Problem ◽  
Dipole Moment ◽  
Point Dipole ◽  
A Charge

scholarly journals Black hole shadows in M-theory scenarios

2021 ◽  
Vol 30 (04) ◽  
pp. 2150026
Author(s):  
A. Belhaj ◽  
M. Benali ◽  
A. El Balali ◽  
W. El Hadri ◽  
H. El Moumni ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Event Horizon ◽  
Moduli Space ◽  
Emission Rate ◽  
Rotation Parameter ◽  
High Energies ◽  
Energy Emission ◽  
M Theory

We study the shadows of four-dimensional black holes in M-theory inspired models. We first inspect the influence of M2-branes on such optical aspects for nonrotating solutions. In particular, we show that the M2-brane number can control the circular shadow size. This geometrical behavior is distorted for rotating solutions exhibiting cardioid shapes in certain moduli space regions. Implementing a rotation parameter, we analyze the geometrical shadow deformations. Among others, we recover the circular behaviors for a large M2-brane number. Investigating the energy emission rate at high energies, we find, in a well-defined approximation, that the associated peak decreases with the M2-brane number. Moreover, we investigate a possible connection with observations (from Event Horizon Telescope or future devices) from a particular M-theory compactification by deriving certain constraints on the M[Formula: see text]-brane number in the light of the [Formula: see text] observational parameters.

scholarly journals The Effect of Remanent Magnetization on Aeromagnetic Interpretation

1957 ◽  
Vol 10 (4) ◽  
pp. 547 ◽  
Author(s):  
DJ Sutton ◽  
WG Mumme
Keyword(s):  
Magnetic Field ◽  
Dipole Moment ◽  
Line Source ◽  
Remanent Magnetization ◽  
Point Dipole ◽  
Earth’S Magnetic Field ◽  
Plane Normal ◽  
Earth's Magnetic Field

The interpretation of aeromagnetic maps when the source may be approximated to a point dipole or line of dipoles is considered for the general case in which the dipole moment is not necessarily parallel to the Earth's magnetic field. For the line of dipoles, it is shown that even in this general case the depth and location of the source can be found, and in addition the direction of the component of the dipole moment in a plane normal to the line source may be determined. If the K�nigsberger ratio for the rock constituting the source is large, this is approximately the direction of the remanent magnetization. Such information is important from a palaeomagnetic viewpoint. When the source approximates closely to a point dipole, it is not possible both to locate the source and determine the direction of the dipole moment from an analysis of the aeromagnetic map and the solution of the problem requires further information.

scholarly journals A quantum hydrodynamical model of skyrmions with electrical dipole moments and novel magneto-electric skyrmion Hall effect

2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
Mariya Iv. Trukhanova ◽  
Pavel Andreev
Keyword(s):  
Magnetic Field ◽  
Dipole Moment ◽  
Hall Effect ◽  
Electric Fields ◽  
Dipole Moments ◽  
Dipole Interaction ◽  
Point Particle ◽  
Hydrodynamic Waves ◽  
Quantum Hydrodynamics ◽  
New Type

Abstract To introduce novel ways of manipulating the skyrmion dynamics we need to develop new fundamental models. Many-particle quantum hydrodynamics allows us to study inter-skyrmion interactions in the approximation of point-particle skyrmions, which were discovered in multiferroic insulators, where the spiral magnetic structure is accompanied by a finite electric dipole moment. We propose a new model of many-particle quantum hydrodynamics for dipolar skyrmions with dipole–dipole interaction, in the presence of electric and magnetic field gradients. Based on the developed model we find a new way to control the positions of skyrmions, using the crossed gradients of magnetic and electric fields or a novel magneto-electric Hall effect. We have shown that the influence of non-uniform magnetic field provides circular motion of the dipolar skyrmion in the plane with the frequency determined by the derivative of the external magnetic field and the amplitude of the dipole moment. We study the wave processes in the system of skyrmions. We investigate hydrodynamic waves in a skyrmion gas in crossed non-uniform electric and magnetic fields, and predict the generation of a new type of hydrodynamic waves and instabilities. Also, we predict a new type of polarization waves in a rigid skyrmion gas with the dipole–dipole interaction.

Electron and cation transport in fluid dimethyl ether: effects of density and temperature

1982 ◽  
Vol 60 (8) ◽  
pp. 1034-1043 ◽  
Author(s):  
Norman Gee ◽  
Gordon R. Freeman
Keyword(s):  
Dipole Moment ◽  
Dimethyl Ether ◽  
Ion Mobility ◽  
Inelastic Collisions ◽  
Localized States ◽  
Point Dipole ◽  
Density Control ◽  
Low Energy Electrons ◽  
Dense Vapor ◽  
Momentum Transfer Cross Section

The effect of molecular electric dipole moment D on charge transport in fluids was examined by measurement of electron and ion mobilities in dimethyl ether (D = 1.3 D) and comparing them with the behavior in hydrocarbons. The fluid density was varied continuously from that of the normal vapor to that of the normal liquid, passing through the critical region. The density normalized mobility nμe of electrons in dimethyl ether vapor at low densities is 30-fold smaller than that in propane, although for the cations nμ+ in the ether is only 1.4-fold smaller than that in the alkane. The permanent dipole moment of the ether dominates the scattering of low energy electrons but not that of cations. The electron momentum transfer cross section is roughly 33% larger than that predicted by the Altshuler point dipole model, and has a minimum at ~0.12 eV. The energy gained from the electric field is removed mainly through inelastic collisions, even in the thermal energy range.Molecular clustering decreases both electron and ion mobilities, but the effect on the former is much larger due to the greater change in reduced mass. The extent of electron quasilocalization in the dense vapor of dimethyl ether is four times greater than that in nonpolar hydrocarbons. Electrons form relatively stable localized states in the liquid at n/ne > 2.0. Ion mobility undergoes a transition from "density control" to "viscosity control" with increasing density in the low density liquid. Viscosity control is operative at n/ne > 2.4.

ANIONS AND ANOMALIES

2007 ◽  
Vol 22 (27) ◽  
pp. 4901-4910 ◽  
Author(s):  
M. BAWIN ◽  
SIDNEY A. COON ◽  
BARRY R. HOLSTEIN
Keyword(s):  
Dipole Moment ◽  
Dipole Moments ◽  
Finite Size ◽  
Binding Energies ◽  
Quantum Mechanical ◽  
Behavior Changes ◽  
Point Dipole ◽  
Long Distance ◽  
Distance Behavior ◽  
Static Point

We analyze the recent claim that experimental measurements of binding energies of dipole-bound anions can be understood in terms of a quantum mechanical anomaly. The discrepancy between the experimental critical dipole moments and that predicted by the anisotropic inverse square potential of a static dipole precludes such an explanation. As has long been known, in the physical problem one must include rotational structure so that the long distance behavior changes from 1/r2 to 1/r4. In a simple model this can be shown to lead to a modification of the critical dipole moment of 20% or so, bringing it into agreement with experiment. This, together with the fact that inclusion of finite size effects does not change the critical dipole moment of the static point dipole, strongly suggests that the quantum mechanical anomaly interpretation of the formation of dipole-bound anions cannot be correct.

scholarly journals Shadow Images of a Rotating Dyonic Black Hole with a Global Monopole Surrounded by Perfect Fluid

Universe ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 23 ◽  
Author(s):  
Sumarna Haroon ◽  
Kimet Jusufi ◽  
Mubasher Jamil
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Perfect Fluid ◽  
Event Horizon ◽  
Emission Rate ◽  
Surface Topology ◽  
Global Monopole ◽  
Energy Emission ◽  
Bonnet Theorem ◽  
Fluid Parameters

In this paper, we revisit the rotating global monopole metric and extend the metric to a rotating dyonic global monopole in the presence of a perfect fluid. We then show that the surface topology at the event horizon, related to the metric computed, is a 2-sphere using the Gauss-Bonnet theorem. By choosing ω = − 1 / 3 , 0 , 1 / 3 we investigate the effect of dark matter, dust and radiation on the silhouette of a black hole. The presence of the global monopole parameter γ and the perfect fluid parameters υ also deform the shape of a black hole’s shadow, which has been depicted through graphical illustrations. Finally, we analyse the energy emission rate of a rotating dyonic global monopole surrounded by perfect fluid with respect to parameters.

THE DIPOLE MOMENT INTERACTION OF BOUND EXCITONS IN HIGHLY EXCITED CdS

1985 ◽  
Vol 46 (C7) ◽  
pp. C7-221-C7-225
Author(s):  
Bao Qingcheng ◽  
Dai Rensong ◽  
Xu Xurong
Keyword(s):  
Dipole Moment ◽  
Moment Interaction
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