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.

scholarly journals FINITE PARTICLE CREATION IN 3+1 DE SITTER SPACE

1995 ◽  
Vol 10 (33) ◽  
pp. 2519-2530
Author(s):  
D.J. LAMB ◽  
A.Z. CAPRI ◽  
M. KOBAYASHI
Keyword(s):  
Particle Creation ◽  
De Sitter Space ◽  
Bogoliubov Transformation ◽  
De Sitter ◽  
Stationary Observer ◽  
Definition Of ◽  
Spacelike Surfaces ◽  
Finite Particle

In this paper we calculate the particle creation as seen by a stationary observer in 3+1 de Sitter space. This particle creation is calculated using an observer-dependent geometrically based definition of time which is used to quantize a field on two different spacelike surfaces. The Bogoliubov transformation relating these two quantizations is then calculated and the resulting particle creation is shown to be finite.

scholarly journals STRING SCATTERING OFF THE (2 + 1)-DIMENSIONAL ROTATING BLACK HOLE

1996 ◽  
Vol 11 (18) ◽  
pp. 1467-1473 ◽  
Author(s):  
MAKOTO NATSUUME ◽  
NORISUKE SAKAI ◽  
MASAMICHI SATO
Keyword(s):  
Black Hole ◽  
De Sitter Space ◽  
Hawking Temperature ◽  
Bogoliubov Transformation ◽  
De Sitter ◽  
Rotating Black Hole ◽  
Black Hole Background ◽  
Dimensional Black Hole

The SL (2, R)/Z WZW orbifold which describes the (2+1)-dimensional black hole approaching anti-de Sitter space asymptotically. We study the 1 → 1 tachyon scattering off the rotating black hole background and calculate the Hawking temperature using the Bogoliubov transformation.

Particle creation in de Sitter space

1985 ◽  
Vol 31 (4) ◽  
pp. 754-766 ◽  
Author(s):  
E. Mottola
Keyword(s):  
Particle Creation ◽  
De Sitter Space ◽  
De Sitter

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 Production of scalar particles in electric field on de Sitter expanding universe

2014 ◽  
Vol 29 (27) ◽  
pp. 1450138 ◽  
Author(s):  
Mihaela-Andreea Băloi
Keyword(s):  
Electric Field ◽  
Particle Production ◽  
Perturbation Methods ◽  
Transition Amplitude ◽  
Scalar Particle ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Scalar Particles ◽  
Sitter Spacetime ◽  
The Universe

The scalar particle production from vacuum in the presence of an electric field, on the de Sitter spacetime is studied. We use perturbation methods to define the transition amplitude. We obtain that the momentum is not conserved in this process. The probability density of pair production is computed by squaring the transition amplitude. Our graphical representations show that, the probability of scalar particle production was important only in the early stages of the universe, when Hubble's constant was very large in comparison with the mass of the particle. Also, we propose here a criterion for particle–antiparticle separation.

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