scholarly journals Millicharged fermion vacuum polarization in a cosmic magnetic field and generation of CMB elliptic polarization

2017 ◽  
Vol 96 (2) ◽  
Author(s):  
Damian Ejlli
Keyword(s):  
Magnetic Field ◽  
Vacuum Polarization ◽  
Elliptic Polarization

scholarly journals VACUUM BIREFRINGENCE CAUSED BY ARBITRARY SPIN PARTICLES

2008 ◽  
Vol 23 (04) ◽  
pp. 245-248 ◽  
Author(s):  
S. I. KRUGLOV
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Laser Beam ◽  
Transverse Magnetic Field ◽  
Vacuum Polarization ◽  
Transverse Magnetic ◽  
Arbitrary Spin ◽  
Effective Lagrangian ◽  
Linearly Polarized ◽  
Higher Spin

We study the propagation of a linearly polarized laser beam in the external transverse magnetic field taking into consideration the vacuum polarization by arbitrary spin particles. Induced ellipticity of the beam is evaluated using the effective Lagrangian. With the help of the PVLAS experimental data, we obtain bounds on masses of charged higher spin particles contributed to ellipticity.

Vacuum polarization in a background magnetic field in (2 + 1)-dimensional QED

1995 ◽  
Vol 73 (7-8) ◽  
pp. 458-462
Author(s):  
D. G. C. McKeon
Keyword(s):  
Magnetic Field ◽  
Path Integral ◽  
Vacuum Polarization ◽  
Quantum Mechanical ◽  
Matrix Elements ◽  
Integral Technique ◽  
Background Magnetic Field ◽  
The One

The one-loop vacuum polarization in the presence of a background magnetic field is computed in (2 + 1)-dimensional electrodynamics in which the spinor mass is parity violating. The quantum-mechanical path-integral technique is used to compute matrix elements arising in the context operator regularization.

scholarly journals A NUMERICAL EVALUATION OF VACUUM POLARIZATION TENSOR IN CONSTANT EXTERNAL MAGNETIC FIELDS

2013 ◽  
Vol 28 (20) ◽  
pp. 1350100 ◽  
Author(s):  
KEN-ICHI ISHIKAWA ◽  
DAIJI KIMURA ◽  
KENTA SHIGAKI ◽  
ASAKO TSUJI
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Landau Level ◽  
Vacuum Polarization ◽  
Form Factors ◽  
Heavy Ion ◽  
Kinematic Parameter ◽  
Polarization Tensor ◽  
Photon Momentum ◽  
Vacuum Polarization Tensor

Hattori–Itakura have recently derived the full Landau-level summation form for the photon vacuum polarization tensor in constant external magnetic fields at the one-loop level. The Landau-level summation form is essential when the photon momentum exceeds the threshold of the pair creation of charged particles in a magnetic field stronger than the squared mass of the charged particle. The tensor has three different form factors depending on the tensor direction with respect to the external magnetic field. The renormalization is nontrivial because these form factors are expressed in terms of double or triple summation forms. We give a numerical UV subtraction method which can be applied to numerically evaluate the form factors in constant external magnetic fields. We numerically investigate the photon vacuum polarization tensor in the form of the Landau-level summation and estimate the systematic errors coming from truncation of the Landau-level summation in a parameter region realized in heavy ion collision experiments. We find that the error is practically controllable at an O(10-2) level for electrons and muons in strong magnetic fields expected in heavy ion collisions in the experimentally feasible kinematic parameter regions.

Energy of a spin- particle in a constant coloured magnetic field

1979 ◽  
Vol 57 (7) ◽  
pp. 994-997 ◽  
Author(s):  
Gerry McKeon
Keyword(s):  
Magnetic Field ◽  
Energy Density ◽  
External Field ◽  
Ground State ◽  
Vacuum Polarization ◽  
Gauge Fields ◽  
Asymptotic Freedom ◽  
Radiative Corrections ◽  
Method Of Calculation ◽  
Spin Particle

Using a method of calculation introduced by Schwinger, the radiative corrections to the motion of the spin [Formula: see text] particle in a constant coloured magnetic field are calculated. This is of interest as Batalin, Matinyan, and Savvidi have recently shown that the asymptotic freedom of coloured gauge fields implies that their energy density may be reduced by switching on a constant coloured magnetic field. It is found that the ground state of the spinor in this external field is not stable. Similar results for the vacuum polarization have been found by Nielsen and Olesen.

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