Electrodynamics and Propagation of a Spin 3/2 Field

1974 ◽  
Vol 52 (10) ◽  
pp. 919-920 ◽  
Author(s):  
A. Z. Capri ◽  
A. Shamaly
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Special Relativity ◽  
External Electromagnetic Field

We show that if a charged Rarita–Schwinger spin 3/2 field is coupled both to an internal as well as external electromagnetic field, acausal propagation will always occur regardless of the external field. Thus the electrodynamics of a Rarita–Schwinger spin 3/2 field is not consistent with special relativity.

Resonant production of electron-positron pairs by a hard gamma-ray on a nucleus in an external electromagnetic field

2020 ◽  
Vol 35 (03) ◽  
pp. 2040025 ◽  
Author(s):  
Nikita R. Larin ◽  
Victor V. Dubov ◽  
Sergei P. Roshchupkin
Keyword(s):  
Electromagnetic Field ◽  
Differential Cross Section ◽  
External Field ◽  
Cross Section ◽  
Differential Cross ◽  
Gamma Ray ◽  
Structure Constant ◽  
External Electromagnetic Field ◽  
Electron Positron ◽  
Resonant Production

The resonant production of electron-positron pairs by a hard gamma-ray on nucleus in an external electromagnetic field is studied theoretically. The main property of this process is that the initial process of the second order in the fine structure constant in an external field effectively splits into two successive processes of the first order due to the fact that in resonant conditions intermediate virtual electron (positron) becomes a real particle. One of these processes is a single-photoproduction of electron-positron pair in a laser field (laser-stimulated Breit-Wheeler process) another is a laser-assisted scattering of electron (positron) on nucleus (laser-assisted Mott scattering). It is shown that the resonances are possible only for the energies of the initial hard gamma-ray more than the characteristic threshold energy. Resonant differential cross section of this process is obtained. It is shown that the resonant differential cross section can significantly exceed the corresponding cross section without an external field. The obtained results may be experimentally verified using the facilities of pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS).

LORENTZ-COVARIANT AND GAUGE-INVARIANT INSTANTANEOUS VACUUM FOR EXTERNAL FIELD PROBLEMS

1994 ◽  
Vol 09 (07) ◽  
pp. 1025-1041
Author(s):  
A. Z. CAPRI ◽  
S. M. ROY
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Gauge Invariance ◽  
External Electromagnetic Field ◽  
Time Dependent ◽  
Dirac Field ◽  
Spacelike Surface ◽  
Bogoliubov Transformation ◽  
Gauge Invariant ◽  
Lorentz Covariance

For a Dirac field coupled to time-dependent external electromagnetic field we define an instantaneous (on a fixed spacelike surface) causal vacuum respecting Lorentz covariance and gauge invariance. The instantaneous particle states on this surface are then defined covariantly and connected to states at another time by a Bogoliubov transformation.

scholarly journals Behaviour of Charged Spinning Massless Particles

2017 ◽  
Author(s):  
Ivan Morales ◽  
Bruno Neves ◽  
Zui Oporto ◽  
Olivier Piguet
Keyword(s):  
Electromagnetic Field ◽  
Charged Particle ◽  
Kinetic Energy ◽  
External Field ◽  
Total Energy ◽  
Lorentz Invariance ◽  
External Electromagnetic Field ◽  
Massless Particles ◽  
Proper Definition

We review some properties of a relativistic classical massless charged particle with spin interacting with an external electromagnetic field. We give in particular a proper definition of kinetic energy and total energy, the latter being conserved when the external field is stationary. We find that the particle’s velocity may differ from c as a result of the spin - electromagnetic field interaction, without jeopardizing Lorentz invariance.

scholarly journals PSEUDOCLASSICAL MODEL OF SPINNING PARTICLE WITH ANOMALOUS MAGNETIC MOMENTUM

1993 ◽  
Vol 08 (05) ◽  
pp. 463-468 ◽  
Author(s):  
D.M. GITMAN ◽  
A.V. SAA
Keyword(s):  
Electromagnetic Field ◽  
External Electromagnetic Field ◽  
Invariant Form ◽  
Pauli Equation ◽  
Spinning Particle ◽  
Dirac Quantization

A generalization of the pseudoclassical action of a spinning particle in the presence of an anomalous magnetic momentum is given. The action is written in reparametrization and supergauge invariant form. The Dirac quantization, based on the Hamiltonian analyzes of the model, leads to the Dirac-Pauli equation for a particle with an anomalous magnetic momentum in an external electromagnetic field. Due to the structure of first class constraints in that case, the Dirac quantization demands for consistency to take into account an operator’s ordering problem.

Electrospun Sodium-Cobalt Oxide Ceramic Nanofiber and the Electromagnetic Responses

2017 ◽  
Author(s):  
Arturo G. Bautista ◽  
Juan A. Aguado ◽  
Yong X. Gan
Keyword(s):  
Electromagnetic Field ◽  
Cobalt Oxide ◽  
External Electromagnetic Field ◽  
Dielectric Behavior ◽  
Ceramic Fiber ◽  
Oxide Ceramic ◽  
Hyperthermia Treatment ◽  
Electromagnetic Responses ◽  
Sodium Cobalt Oxide ◽  
Heating Behavior

In this work, a sodium-cobalt oxide (NaxCo2O4) ceramic composite nanofiber was manufactured through electrospinning. The response of the fiber to external electromagnetic field was characterized to observe the heat generation in the fiber. In addition, we also measured the current passing through the fiber under the polarization of DC potential. It is found that the fiber has intensive heating behavior when it is exposed to the electromagnetic field. The temperature increases more than 5 degrees in Celsius scale only after 5 s exposure. The current – potential curve of the fiber reveals its dielectric behavior. It is concluded that this ceramic fiber has the potential to be used for hyperthermia treatment in biomedical engineering or for energy conversions.

ELECTROMAGNETIC DETECTION OF AXIONS IN A WAVE GUIDE

1998 ◽  
Vol 13 (11) ◽  
pp. 873-878 ◽  
Author(s):  
DANG VAN SOA
Keyword(s):  
Electromagnetic Field ◽  
Cross Sections ◽  
Differential Cross ◽  
External Electromagnetic Field ◽  
Wave Guide ◽  
Differential Cross Sections ◽  
Electromagnetic Detection

The conversion of photons into axions in a periodic external electromagnetic field, i.e. the TEm0 mode, is considered in details by using Feynman methods. The differential cross-sections are given. It is shown that the lowest mode gives the main contribution to the considered process.

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