scholarly journals Magnetic field effect in the fine-structure constant and electron dynamical mass

2019 ◽  
Vol 100 (9) ◽  
Author(s):  
E. J. Ferrer ◽  
A. Sanchez
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Dynamical Mass

scholarly journals Quantum Electrodynamics in Strong Magnetic Fields. IV. Electron Self-energy

1987 ◽  
Vol 40 (1) ◽  
pp. 1 ◽  
Author(s):  
AJ Parle
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Quantum Electrodynamics ◽  
Mass Shell ◽  
Mass Operator ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Strong Magnetic Fields ◽  
Self Energy ◽  
Cyclotron Emission

The electron self-energy in a magnetic field is calculated with the effect of the field included exactly. A new representation of the wavefunctions and other quantities is defined, in which the mass operator has a particularly simple form. After renormalisation, the form of the mass operator allows corrections to the Dirac equation, wavefunctions, vertex function and the electron propagator close to the mass shell to be calculated to lowest order in the fine structure constant. The probability for an electron to change spin while remaining in the same Landau level is calculated, and is found to be much less than the probability of cyclotron emission.

scholarly journals Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation

2019 ◽  
Vol 485 (4) ◽  
pp. 5050-5058 ◽  
Author(s):  
J Hu ◽  
J K Webb ◽  
T R Ayres ◽  
M B Bainbridge ◽  
J D Barrow ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
White Dwarf ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Line Profiles ◽  
Space Telescope ◽  
Gravitational Fields ◽  
Upper Limit ◽  
The Magnetic Field

ABSTRACT White dwarf (WD) atmospheres are subjected to gravitational potentials around 105 times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravitational fields. However, a sufficiently strong magnetic field will alter absorption line profiles and introduce additional uncertainties in measurements of the fine structure constant. Estimating the magnetic field strength is thus essential in this context. Here, we model the absorption profiles of a large number of atomic transitions in the WD photosphere, including first-order Zeeman effects in the line profiles, varying the magnetic field as a free parameter. We apply the method to a high signal-to-noise, high-resolution, far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph spectrum of the WD G191−B2B. The method yields a sensitive upper limit on its magnetic field of B < 2300 G at the 3σ level. Using this upper limit, we find that the potential impact of quadratic Zeeman shifts on measurements of the fine structure constant in G191−B2B is 4 orders of magnitude below laboratory wavelength uncertainties.

Analysis of the fine structure of a4T1level of ad5ion coupled to ɛ vibrational modes from the magnetic-field effect

1998 ◽  
Vol 58 (19) ◽  
pp. 12567-12570 ◽  
Author(s):  
D. Boulanger ◽  
R. Parrot ◽  
M. N. Diarra ◽  
U. W. Pohl ◽  
B. Litzenburger ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Vibrational Modes ◽  
The Magnetic Field

The Model for Calculation the Hall Effect Parameter

2004 ◽  
Vol 9 (2) ◽  
pp. 129-138
Author(s):  
J. Kleiza ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Mapping Method ◽  
Sample Thickness ◽  
System Of Nonlinear Equations ◽  
Specific Resistivity ◽  
Conformal Mapping Method ◽  
Effect Parameter ◽  
The Magnetic Field

A method for calculating the values of specific resistivity ρ as well as the product µHB of the Hall mobility and magnetic induction on a conductive sample of an arbitrary geometric configuration with two arbitrary fitted current electrodes of nonzero length and has been proposed an grounded. During the experiment, under the constant value U of voltage and in the absence of the magnetic field effect (B = 0) on the sample, the current intensities I(0), IE(0) are measured as well as the mentioned parameters under the effect of magnetic fields B1, B2 (B1 ≠ B2), i.e.: IE(β(i)), I(β(i)), i = 1, 2. It has been proved that under the constant difference of potentials U and sample thickness d, the parameters I(0), IE(0) and IE(β(i)), I(β(i)), i = 1, 2 uniquely determines the values of the product µHB and specific resistivity ρ of the sample. Basing on the conformal mapping method and Hall’s tensor properties, a relation (a system of nonlinear equations) between the above mentioned quantities has been found.

Magnetic field effect on the electrodeposition of ZnSe

2015 ◽  
Vol 51 (2) ◽  
pp. 345-352 ◽  
Author(s):  
R. Kowalik ◽  
K. Mech ◽  
D. Kutyla ◽  
T. Tokarski ◽  
P. Zabinski
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect
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