scholarly journals THE ANAPOLE MOMENT IN SCALAR QUANTUM ELECTRODYNAMICS

2010 ◽  
Vol 25 (37) ◽  
pp. 3145-3150 ◽  
Author(s):  
A. BASHIR ◽  
Y. CONCHA-SÁNCHEZ ◽  
M. E. TEJEDA-YEOMANS ◽  
J. J. TOSCANO
Keyword(s):  
Quantum Electrodynamics ◽  
Scalar Particle ◽  
Charged Scalar ◽  
Current Conservation ◽  
Anapole Moment ◽  
Effective Lagrangian ◽  
Physical Observable ◽  
Scalar Quantum ◽  
Charged Scalar Particle ◽  
Shell Particles

The anapole moment of a massless charged scalar particle is studied in a model-independent fashion, using the effective Lagrangian technique, as well as radiatively within the context of scalar quantum electrodynamics (SQED). It is shown that this gauge structure is characterized by a non-renormalizable interaction, which is radiatively generated at one-loop. It is found that the resulting anapole moment for off-shell particles, though free of ultraviolet divergences, is gauge dependent and thus it is not a physical observable. We also study some of its kinematical limits. In particular, it is shown that its value comes out to be zero when the photon is on-shell and the momenta squared of the incoming and outgoing scalars are equal. It is a stronger statement than it being zero for all particles being on-shell which is required by the current conservation.

scholarly journals Scalar quantum electrodynamics via Duffin–Kemmer–Petiau gauge theory in the Heisenberg picture: Vacuum polarization

2018 ◽  
Vol 33 (10) ◽  
pp. 1850059 ◽  
Author(s):  
J. Beltran ◽  
N. T. Maia ◽  
B. M. Pimentel
Keyword(s):  
Gauge Theory ◽  
Quantum Electrodynamics ◽  
Vacuum Polarization ◽  
External Electromagnetic Field ◽  
Charged Scalar ◽  
Heisenberg Picture ◽  
Perturbative Method ◽  
Scalar Quantum ◽  
Charge Renormalization ◽  
Vacuum Polarization Tensor

Scalar Quantum Electrodynamics is investigated in the Heisenberg picture via the Duffin-Kemmer-Petiau gauge theory. On this framework, a perturbative method is used to compute the vacuum polarization tensor and its corresponding induced current for the case of a charged scalar field in the presence of an external electromagnetic field. Charge renormalization is brought into discussion for the interpretation of the results for the vacuum polarization.

VACUUM FLUCTUATION CORRECTIONS TO MAXWELL ELECTRODYNAMICS REVISITED

2013 ◽  
Vol 28 (19) ◽  
pp. 1350095
Author(s):  
J. L. TOMAZELLI ◽  
D. E. ZANELLATO
Keyword(s):  
Quantum Electrodynamics ◽  
Zero Point ◽  
External Electromagnetic Field ◽  
Dirac Field ◽  
Fermion Field ◽  
Point Energy ◽  
Effective Lagrangian ◽  
Maxwell Electrodynamics ◽  
Scalar Quantum ◽  
Lagrangian Densities

The influence of an external electromagnetic field on the vacuum structure of a quantized Dirac field is investigated by considering the quantum corrections to classical Maxwell's Lagrangian density induced by fluctuations of the nonperturbative vacuum. Effective Lagrangian densities for Maxwell's theory in (3 + 1) and (2 + 1) dimensions are derived from the vacuum zero-point energy of the fermion field in the context of a consistent Pauli–Villars–Rayski subtraction scheme, recovering Euler–Kockel–Heisenberg and Maxwell–Chern–Simons effective theories. Effective Scalar Quantum Electrodynamics is also discussed.

SOME REMARKS ON TOPOLOGICAL DEFECTS AND THEIR GRAVITATIONAL CONSEQUENCES

2002 ◽  
Vol 17 (29) ◽  
pp. 4365-4374 ◽  
Author(s):  
VALDIR B. BEZERRA ◽  
GEUSA DE A. MARQUES ◽  
NAIL R. KHUSNUTDINOV
Keyword(s):  
Hydrogen Atom ◽  
Cosmic String ◽  
Topological Defect ◽  
Solid Angle ◽  
Topological Defects ◽  
Scalar Particle ◽  
Global Monopole ◽  
Charged Scalar ◽  
Charged Scalar Particle ◽  
The Universe

We calculate the energy radiated by a uniformly moving charged scalar particle in the spacetime of a point-like global monopole, for small solid angle deficit. We show that this energy is proportional to the cube of the velocity of the particle and to the cube of the Lorenz factor, in the non-relativistic and ultra-relativistic cases, respectively. We also determine the energy shifts of a hydrogen atom placed in the background spacetime of a cosmic string and we discuss the possibility that these shifts could provide a means of probing for the presence of this topological defect in the Universe.

PARTICLE PRODUCTION IN COSMOLOGICAL SPACETIMES WITH ELECTROMAGNETIC FIELDS

2009 ◽  
Vol 24 (14) ◽  
pp. 1129-1136 ◽  
Author(s):  
SHAHPOOR MORADI
Keyword(s):  
Electromagnetic Fields ◽  
Particle Production ◽  
Charged Particles ◽  
Particle Creation ◽  
Scalar Particle ◽  
De Sitter Space ◽  
Bogoliubov Transformation ◽  
De Sitter ◽  
Charged Scalar ◽  
Charged Scalar Particle

We calculate the charged scalar particle creation in the presence of gravitational and electromagnetic fields in two models of spatially flat Robertson–Walker spacetimes: de Sitter space and asymptotically radiation dominated model. We used the Bogoliubov transformation to compute the rate of production of the particles. Possibility of creation of massless charged particles is also discussed.

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