A novel perturbation theory describes electromagnetic field components in a bubble regime of plasma wakefield

Scilight ◽  
2017 ◽  
Vol 2017 (12) ◽  
pp. 120009
Author(s):  
Rachele Hendricks-Sturrup
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Bubble Regime ◽  
Plasma Wakefield

Energy, Information, and Superluminal Speed in Quantum Electrodynamics

2020 ◽  
pp. 27-33
Author(s):  
Boris A. Veklenko
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Quantum Electrodynamics ◽  
Excited Atom ◽  
Standard Quantum ◽  
Energy Information

Without using the perturbation theory, the article demonstrates a possibility of superluminal information-carrying signals in standard quantum electrodynamics using the example of scattering of quantum electromagnetic field by an excited atom.

A REFORMULATED BOUNDARY PERTURBATION THEORY IN ELECTROMAGNETISM AND ITS APPLICATION TO A SPHERE

1967 ◽  
Vol 45 (5) ◽  
pp. 1729-1743 ◽  
Author(s):  
M. L. Burrows
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Classical Method ◽  
Experimental Results ◽  
Boundary Perturbation ◽  
Conducting Sphere ◽  
Classical Formulation ◽  
Classical Class ◽  
New Formulation ◽  
Boundary Perturbations

The classical method of solving electromagnetic field problems involving boundary perturbations is reformulated in a way that is both more general and simpler. The new formulation makes it easier to apply the theory to the class of boundaries amenable to the classical formulation, and shows that it can also be applied to other boundary shapes. As an example, the perfectly conducting sphere with surface perturbations has been treated, using the methods appropriate only for boundaries in the classical class and also using those applicable to the larger class. Some experimental results which appear to support the theory are reported.

scholarly journals Velocity effect on the stimulated transition process of a multilevel atom in a thermal bath

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Huabing Cai
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Transition Process ◽  
Stimulated Emission ◽  
Atomic Transition ◽  
Thermal Bath ◽  
Transition Rates ◽  
Atomic Polarizability ◽  
Velocity Effect ◽  
Multilevel Atom

AbstractThis paper investigates the stimulated transition process of a uniformly moving atom in interaction with a thermal bath of the quantum electromagnetic field. Using the perturbation theory, the atomic stimulated emission and absorption rates are calculated. The results indicate that the atomic transition rates depend crucially on the atomic velocity, the temperature of the thermal bath, and the atomic polarizability. As these factors change, the atomic stimulated transition processes can be enhanced or weakened at different degrees. In particular, slowly moving atoms in the thermal bath with high temperature ($$T\gg \omega _{0}$$ T ≫ ω 0 ) perceive a smaller effective temperature $$T \big ( 1-\frac{1}{10} v^{2} \big )$$ T ( 1 - 1 10 v 2 ) for the polarizability perpendicular to the atomic velocity or $$T \big ( 1-\frac{3}{10} v^{2} \big )$$ T ( 1 - 3 10 v 2 ) for the polarizability parallel to the atomic velocity. However, ultra-relativistic atoms perceive no influence of the background thermal bath. In turn, in terms of the atomic transition rates, this paper explores and examines the relativity of temperature of the quantum electromagnetic field.

Singularities of electron kernel functions in an external electromagnetic field

1954 ◽  
Vol 222 (1148) ◽  
pp. 93-108 ◽  
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Wave Equation ◽  
Vacuum Polarization ◽  
Proper Time ◽  
External Electromagnetic Field ◽  
Kernel Functions ◽  
Second Order ◽  
Significant Part ◽  
Second Order Wave Equation

The electron kernel functions are derived from solutions of the second-order wave equation, using the proper-time parametrization. Iterated kernel functions are introduced and a gauge-independent perturbation theory is developed. The separation of singular parts proceeds in terms of the iterated kernel functions valid in the absence of an electromagnetic field, and the singular expressions which have to be compensated in order to determine the physically significant part of the vacuum polarization are obtained in a more transparent form than those given originally by Heisenberg.

scholarly journals Temporal and spatial expansion of a multi-dimensional model for electron acceleration in the bubble regime

2014 ◽  
Vol 32 (2) ◽  
pp. 277-284 ◽  
Author(s):  
J. Thomas ◽  
A. Pukhov ◽  
I.Yu. Kostyukov
Keyword(s):  
Bubble Radius ◽  
Energetic Electron ◽  
Particle Spectrum ◽  
Dimensional Model ◽  
Full Field ◽  
Highly Nonlinear ◽  
Piecewise Model ◽  
Temporal And Spatial ◽  
Bubble Regime ◽  
Plasma Wakefield

AbstractAn extended analytical model for particle dynamics in fields of a highly-nonlinear plasma wakefield (the bubble or blow out regime) is derived. A recently proposed piecewise model is generalized to include a time dependent bubble radius and full field solution in the acceleration direction. Incorporation of the cavity dynamics in the model is required to simulate the particle trapping properly. On the other hand, it is shown that the previously reported piecewise model does not reproduce the formation of a mono energetic peak in the particle spectrum. The mono energetic electron beams are recovered only when the full longitudinal field gradient is included in the model.

scholarly journals Bubble regime of plasma wakefield in 2D and 3D geometries

2018 ◽  
Vol 25 (10) ◽  
pp. 103107 ◽  
Author(s):  
A. A. Golovanov ◽  
I. Yu. Kostyukov
Keyword(s):  
Bubble Regime ◽  
2D And 3D ◽  
Plasma Wakefield

scholarly journals Analytic model for electromagnetic fields in the bubble regime of plasma wakefield in non-uniform plasmas

2017 ◽  
Vol 24 (10) ◽  
pp. 103104 ◽  
Author(s):  
A. A. Golovanov ◽  
I. Yu. Kostyukov ◽  
J. Thomas ◽  
A. Pukhov
Keyword(s):  
Electromagnetic Fields ◽  
Analytic Model ◽  
Bubble Regime ◽  
Plasma Wakefield
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