Recoil velocity of pulsar/magnetar induced by magnetic dipole and quadrupole radiation

2012 ◽  
Vol 8 (S291) ◽  
pp. 428-430
Author(s):  
Yasufumi Kojima
Keyword(s):  
Magnetic Dipole ◽  
Maximum Velocity ◽  
Back Reaction ◽  
Arbitrary Field ◽  
Geometrical Configuration ◽  
Recoil Velocity ◽  
Rapid Rotation ◽  
Resultant Velocity ◽  
Magnetic Quadrupole ◽  
Spatial Velocity

AbstractRecoil velocity is examined as a back reaction to the magnetic dipole and quadrupole radiations from a pulsar/magnetar born with rapid rotation. The model is extended from notable Harrison-Tademaru one by including arbitrary field-strength of the magnetic quadrupole moment. The process is slow one operating on a spindown timescale. Resultant velocity depends on not the magnitude, but rather the ratio of the two moments and their geometrical configuration. The model does not necessarily lead to high spatial velocity for a magnetar with a strong magnetic field. This fact is consistent with the recent observational upper bound. The maximum velocity predicted with this model is slightly smaller than that of observed fast-moving pulsars.

scholarly journals Magnetic Multipole Transition Probabilities

1971 ◽  
Vol 2 ◽  
pp. 555-560
Author(s):  
R. H. Garstang
Keyword(s):  
Quantum Mechanics ◽  
Magnetic Dipole ◽  
Transition Probabilities ◽  
Relativistic Quantum ◽  
Relativistic Quantum Mechanics ◽  
Dipole Radiation ◽  
Magnetic Quadrupole

AbstractA review is given of the occurrence and transition probabilities of spectrum lines arising from magnetic quadrupole radiation. Magnetic dipole radiation in relativistic quantum mechanics is also discussed.

scholarly journals Magnetic quadrupole assemblies with arbitrary shapes and magnetizations

2019 ◽  
Vol 4 (35) ◽  
pp. eaax8977 ◽  
Author(s):  
Hongri Gu ◽  
Quentin Boehler ◽  
Daniel Ahmed ◽  
Bradley J. Nelson
Keyword(s):  
Magnetic Dipole ◽  
Colloidal Particles ◽  
Design Method ◽  
Particle Interaction ◽  
Combinatorial Design ◽  
Range Interaction ◽  
Soft Robots ◽  
Magnetic Dipoles ◽  
Magnetic Quadrupole ◽  
Arbitrary Shapes

Magnetic dipole-dipole interactions govern the behavior of magnetic matter across scales from micrometer colloidal particles to centimeter magnetic soft robots. This pairwise long-range interaction creates rich emergent phenomena under both static and dynamic magnetic fields. However, magnetic dipole particles, from either ferromagnetic or paramagnetic materials, tend to form chain-like structures as low-energy configurations due to dipole symmetry. The repulsion force between two magnetic dipoles raises challenges for creating stable magnetic assemblies with complex two-dimensional (2D) shapes. In this work, we propose a magnetic quadrupole module that is able to form stable and frustration-free magnetic assemblies with arbitrary 2D shapes. The quadrupole structure changes the magnetic particle-particle interaction in terms of both symmetry and strength. Each module has a tunable dipole moment that allows the magnetization of overall assemblies to be programmed at the single module level. We provide a simple combinatorial design method to reach both arbitrary shapes and arbitrary magnetizations concurrently. Last, by combining modules with soft segments, we demonstrate programmable actuation of magnetic metamaterials that could be used in applications for soft robots and electromagnetic metasurfaces.

scholarly journals On the timing histories of the crab, PSR1509-58 and PSR0540-69

1996 ◽  
Vol 160 ◽  
pp. 107-108
Author(s):  
Alberto Carramiñana ◽  
César Alvarez
Keyword(s):  
Simple Model ◽  
Magnetic Dipole ◽  
Energy Budget ◽  
Particle Accelerator ◽  
Time Behaviour ◽  
Magnetic Quadrupole

AbstractA simple model of a combined magnetic dipole, gravitational and/or magnetic quadrupole and particle accelerator is applied to simulate the time behaviour of the timing parameters of PSR 0531+21, PSR 1509-58 and PSR0540-69, as well as their energy budget. The model restricts the allowed values for the second braking index and is therefore testable through measurements of.

On the effect of particle couples on the motion of a dilute suspension of spheroids

1971 ◽  
Vol 46 (2) ◽  
pp. 395-416 ◽  
Author(s):  
L. G. Leal
Keyword(s):  
Magnetic Field ◽  
Velocity Field ◽  
Magnetic Dipole ◽  
Newtonian Fluid ◽  
General Situation ◽  
Dipole Axis ◽  
Bulk Motion ◽  
Resultant Velocity ◽  
Dilute Suspension ◽  
The Magnetic Field

This paper is concerned with the effect on the bulk motion of applying torque by external means to the particles of a suspension. Our investigation is based upon theoretical consideration of the motion of a dilute suspension of permanently magnetized spheroids, in the presence of a uniform magnetic field, for cases in which the motion of a Newtonian fluid would be uni-directional. For convenience, we have divided the work into two parts: in the first, the particles are assumed to be perfectly spherical and the magnetic field strength to be arbitrary; in the second, the particles are taken as arbitrary spheroids (with their magnetic dipole axis coincident with the axis of revolution), but the magnetic field is assumed to be strong enough to ensure that the magnetic dipole axis of each particle is effectively aligned with the field vector H. We concentrate attention on the development of general criteria which allow an a priori determination as to whether the bulk motion remains uni-directional in the presence of particle couples, and (when the motion is uni-directional) whether the resultant velocity profile has the same form as for a Newtonian fluid. In addition, we evaluate the effective viscosity of the suspension for several representative cases in which the velocity field is Newtonian in form. Finally, as an example of the general situation in which the bulk velocity field does not remain uni-directional, we obtain the solution for the motion through a circular tube when the magnetic particles are spherical and the magnetic field is applied at right angles to the tube axis.

scholarly journals Transverse Kerker Effect in All-Dielectric Spheroidal Particles

2021 ◽  
Author(s):  
Mikhail M. Bukharin ◽  
Vladimir Ya. Pecherkin ◽  
Anar K. Ospanova ◽  
Vladimir B. Il’in ◽  
Leonid M. Vasilyak ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Magnetic Dipole ◽  
Electric Dipole ◽  
Dipole Moments ◽  
High Index ◽  
Proof Of Concept ◽  
Spheroidal Particle ◽  
Lateral Direction ◽  
Dielectric Particles ◽  
Magnetic Quadrupole

Abstract Kerker effect is one of the unique phenomena in modern electrodynamics. Due to overlapping of electric and magnetic dipole moments, all-dielectric particles can be invisible in forward or backward directions. In our paper we propose new conditions between resonantly excited electric dipole and magnetic quadrupole in ceramic high index spheroidal particle for demonstrating transverse Kerker effect. Moreover, we perform proof-of-concept microwave experiment and demonstrate dumbbell radiation pattern with suppressed scattering in both forward and backward direction and enhanced scattering in lateral direction. Our concept is promising for future planar lasers, nonreflected metasurface and laterally excited waveguides and nanoantennas.

scholarly journals Dielectric nanoresonator for enhancement of 2D material photoluminescence

2021 ◽  
Vol 2015 (1) ◽  
pp. 012166
Author(s):  
Vitaly Yaroshenko ◽  
Pavel Kustov ◽  
Dmitry Zuev
Keyword(s):  
Magnetic Dipole ◽  
Purcell Factor ◽  
Basic Part ◽  
2D Material ◽  
Transmitted Information ◽  
Telecommunication Systems ◽  
Magnetic Quadrupole ◽  
Directivity Patterns ◽  
2D Nanomaterials

Abstract Nowadays the volume of transmitted information exponentially grows and requires the development of new telecommunication systems. Dielectric nanoresonators can be considered as a basic part of such systems to control the emission of the nanoscale source. Here we numerically investigated resonant dielectric nanoresonators for emission enhancements of 2D nanomaterials. We show that the radiative Purcell factor can achieve the value of up to 21 and 12 for the magnetic quadrupole and dipole responses, respectively. Also, we compare the directivity patterns for magnetic dipole and quadrupole resonances. The results obtained in this work can be applied in the development of optical chips and interfaces.

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