scholarly journals The Novel Mechanism of Pair Creation in Pulsar Magnetospheres

Universe ◽  
2021 ◽  
Vol 7 (9) ◽  
pp. 331
Author(s):  
Zaza Osmanov ◽  
George Machabeli ◽  
Nino Chkheidze
Keyword(s):  
Pair Production ◽  
Electrostatic Field ◽  
Pair Creation ◽  
The Novel ◽  
Number Density ◽  
Creation Process ◽  
Electron Positron ◽  
Normal Period ◽  
Effects Of Rotation ◽  
Field Approaches

In this paper we study the possibility of efficient pair production in a pulsar’s magnetosphere. It has been shown that by means of relativistic centrifugal force the electrostatic field exponentially amplifies. As a result the field approaches the Schwinger limit leading to a pair creation process in the light cylinder area where the effects of rotation are very efficient. Analysing the parameters of the normal period (∼1 s) pulsars we found that the process is so efficient that the number density of electron–positron pairs exceeds the Goldreich–Julian density by five orders of magnitude.

scholarly journals Electron-Positron Pair Photoproduction in a Strong Magnetic Field Through the Polarization Cascade

2020 ◽  
Vol 65 (3) ◽  
pp. 187
Author(s):  
M. Diachenko ◽  
O. Novak ◽  
R. Kholodov ◽  
A. Fomina
Keyword(s):  
Magnetic Field ◽  
Pair Production ◽  
Strong Magnetic Field ◽  
Single Photon ◽  
Threshold Value ◽  
Pair Creation ◽  
Landau Levels ◽  
Radiation Correction ◽  
Electron Positron ◽  
Electron Positron Pair

The process of the e−e+ pair photoproduction in a strong magnetic field through the polarization cascade (the creation of an e−e+ pair from a single photon and its subsequent annihilation to a single photon) has been considered. The kinematics of the process is analyzed, and the expression for the general amplitude is obtained. A radiation correction to the process of pair creation at the lowest Landau levels by a single photon is found in the case where the energy of this photon is close to the threshold value. A comparison with the process of e−e+ pair production by one photon is made.

scholarly journals Pair-production of cusps on a string in AdS3

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
David Vegh
Keyword(s):  
Pair Production ◽  
Discrete System ◽  
Gordon Equation ◽  
Equation Of Motion ◽  
Pair Creation ◽  
Speed Of Light ◽  
Final State ◽  
Classical Motion ◽  
Direct Energy ◽  
The Moment

Abstract The classical motion of a Nambu-Goto string in AdS3 spacetime is governed by the generalized sinh-Gordon equation. It can locally be reduced to the sinh-Gordon (shG), cosh-Gordon (chG), or Liouville equation, depending on the value of the scalar curvature of the induced metric. In this paper, I examine solutions that contain both shG-type and chG-type regions. The boundary between these regions moves with the speed of light. I show that near such boundaries (generalized) solitons can be classically pair-produced. The solitons move subluminally (superluminally) in the shG (chG) region on the worldsheet, and they correspond to cusps on the string. A direct energy cascade is observed at the moment of pair-creation.For the calculations, I use an exact discretization of the equation of motion. The solutions are segmented strings. In this discrete system, pair-production leads to a complete evaporation of the shG region. The final state is a gas of cusps in a chG environment.

Vacuum polarization and particle creation in the presence of a potential step

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641031 ◽  
Author(s):  
S. P. Gavrilov ◽  
D. M. Gitman
Keyword(s):  
Electric Potential ◽  
Canonical Quantization ◽  
Particle Creation ◽  
Pair Creation ◽  
Dirac Field ◽  
Potential Step ◽  
Electron Positron ◽  
Physical Impact ◽  
Particle Interpretation ◽  
Electron Positron Pair

We consider QED with strong external backgrounds that are concentrated in restricted space areas. The latter backgrounds represent a kind of spatial x-electric potential steps for charged particles. They can create particles from the vacuum, the Klein paradox being closely related to this process. We describe a canonical quantization of the Dirac field with x-electric potential step in terms of adequate in- and out-creation and annihilation operators that allow one to have consistent particle interpretation of the physical system under consideration and develop a nonperturbative (in the external field) technics to calculate scattering, reflection, and electron-positron pair creation. We resume the physical impact of this development.

Electron-Positron Pair Production in an Elliptic Polarized Time Varying Field

2012 ◽  
Vol 29 (2) ◽  
pp. 021102 ◽  
Author(s):  
Bai-Song Xie ◽  
Mohamedsedik Melike ◽  
Dulat Sayipjamal
Keyword(s):  
Pair Production ◽  
Time Varying ◽  
Electron Positron ◽  
Electron Positron Pair

Noncommutative scalar field in de Sitter space–time and pair creation process

2021 ◽  
Vol 36 (02) ◽  
pp. 2150011
Author(s):  
Nabil Mehdaoui ◽  
Lamine Khodja ◽  
Salah Haouat
Keyword(s):  
Scalar Field ◽  
Chemical Potential ◽  
De Sitter Space ◽  
Space Time ◽  
Pair Creation ◽  
De Sitter ◽  
Creation Process ◽  
Scalar Particles ◽  
Constant Electromagnetic Field

In this work, we address the process of pair creation of scalar particles in [Formula: see text] de Sitter space–time in presence of a constant electromagnetic field by applying the noncommutativity on the scalar field up to first-order in [Formula: see text]. We calculate the density of particles created in the vacuum by the mean of the Bogoliubov transformations. In contrast to a previous result, we show that noncommutativity contributes to the pair creation process. We find that the noncommutativity plays the same role of chemical potential and gives an important interest for studies at high energies.

Sign in / Sign up

Export Citation Format

Share Document