scholarly journals Total yield of electron-positron pairs produced from vacuum in strong electromagnetic fields: Validity of the locally constant field approximation

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
D. G. Sevostyanov ◽  
I. A. Aleksandrov ◽  
G. Plunien ◽  
V. M. Shabaev
Keyword(s):  
Electromagnetic Fields ◽  
Total Yield ◽  
Field Approximation ◽  
Constant Field ◽  
Electron Positron

scholarly journals Improved local-constant-field approximation for strong-field QED codes

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
A. Di Piazza ◽  
M. Tamburini ◽  
S. Meuren ◽  
C. H. Keitel
Keyword(s):  
Strong Field ◽  
Field Approximation ◽  
Constant Field

scholarly journals Energy, momentum, mass, and velocity of a moving body in the light of gravitomagnetic theory

2014 ◽  
Vol 92 (10) ◽  
pp. 1074-1081
Author(s):  
Sergey G. Fedosin
Keyword(s):  
Electromagnetic Fields ◽  
Characteristic Size ◽  
Field Approximation ◽  
Weak Field ◽  
The Body ◽  
Covariant Theory ◽  
Gravitational Fields ◽  
Moving Body ◽  
Strong Gravitation ◽  
Energy And Momentum

In the weak-field approximation of the covariant theory of gravitation the 4/3 problem is formulated for internal and external gravitational fields of a body in the form of a uniform ball. The dependence of the energy and the mass of the moving body on the energy of the field accompanying the body, as well as the dependence on the characteristic size of the body are described. Additions in the energy and the momentum of the system, defined by the energy and momentum of the gravitational and electromagnetic fields, associated with the body, are explicitly calculated. The conclusion is made that the energy and the mass of the system can be described through the energy of ordinary and strong gravitation and through the energies of electromagnetic fields of particles that compose the body.

scholarly journals A thermodynamic description for physiological transmembrane transport

F1000Research ◽  
2021 ◽  
Vol 7 ◽  
pp. 1468
Author(s):  
Marco Arieli Herrera-Valdez
Keyword(s):  
Common Ground ◽  
Transmembrane Potential ◽  
Thermodynamic Description ◽  
Field Approximation ◽  
Transmembrane Transport ◽  
Constant Field ◽  
Asymmetric Flow ◽  
Biophysical Study ◽  
Transmembrane Currents ◽  
Existing Data

A general formulation for both passive and active transmembrane transport is derived from basic thermodynamical principles. The derivation takes into account the energy required for the motion of molecules across membranes and includes the possibility of modeling asymmetric flow. Transmembrane currents can then be described by the general model in the case of electrogenic flow. As it is desirable in new models, it is possible to derive other well-known expressions for transmembrane currents as particular cases of the general formulation. For instance, the conductance-based formulation for current turns out to be a linear approximation of the general formula for current. Also, under suitable assumptions, other formulas for current based on electrodiffusion, like the constant field approximation by Goldman, can be recovered from the general formulation. The applicability of the general formulations is illustrated first with fits to existing data, and after, with models of transmembrane potential dynamics for pacemaking cardiocytes and neurons. The general formulations presented here provide a common ground for the biophysical study of physiological phenomena that depend on transmembrane transport.

scholarly journals Photon emission in strong fields beyond the locally-constant field approximation

2019 ◽  
Vol 100 (11) ◽  
Author(s):  
I. A. Aleksandrov ◽  
G. Plunien ◽  
V. M. Shabaev
Keyword(s):  
Photon Emission ◽  
Field Approximation ◽  
Constant Field ◽  
Strong Fields

scholarly journals Radiatively induced Lorentz and CPT violation in Schwinger constant field approximation

2001 ◽  
Vol 503 (1-2) ◽  
pp. 215-222 ◽  
Author(s):  
M. Chaichian ◽  
W.F. Chen ◽  
R. González Felipe
Keyword(s):  
Field Approximation ◽  
Constant Field ◽  
Cpt Violation

scholarly journals Pair Production in Intense Electromagnetic Fields of Pulsars

1987 ◽  
Vol 125 ◽  
pp. 61-61
Author(s):  
T.Y. Shi
Keyword(s):  
Pair Production ◽  
Electromagnetic Fields ◽  
Quantum Electrodynamics ◽  
High Energy ◽  
Electron Positron

The possible existence of strong electromagnetic fields in pulsars has motivated extensive interest in investigation of various quantum electrodynamics processes. In particular, the process of converting high energy photons into electron-positron pairs is of great significance in pulsar theory.

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