scholarly journals Search for bound-state electron+positron pair decay

2016 ◽  
Vol 123 ◽  
pp. 04003 ◽  
Author(s):  
F. Bosch ◽  
S. Hagmann ◽  
P.-M. Hillenbrand ◽  
G. J. Lane ◽  
Yu. A. Litvinov ◽  
...  
Keyword(s):  
Bound State ◽  
State Electron ◽  
Electron Positron ◽  
Electron Positron Pair

QUASI-POSITRONIUM IN METALS

1964 ◽  
Vol 42 (10) ◽  
pp. 1908-1913 ◽  
Author(s):  
A. Held ◽  
S. Kahana
Keyword(s):  
Positron Annihilation ◽  
Basic Equation ◽  
Schrodinger Equation ◽  
Bound State ◽  
The State ◽  
Low Density ◽  
Electron Gases ◽  
Electron Positron ◽  
Electron Positron Pair ◽  
Quasi Bound State

A variational search is made for a quasi-bound state of an electron–positron pair in a metal. The basic equation used is the effective Schrödinger equation derived from the electron–positron propagator in an approximation which accurately accounts for the two-body correlations. It is found that no such state exists in metals and hence it can have no influence on the positron annihilation rates. However, the state appears for electron gases of sufficiently low density, [Formula: see text],* and thus determines the low-density annihilation rates.

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

scholarly journals Diverse Features of the Multiwavelength Afterglows of Gamma-Ray Bursts: Natural or Special?

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
J. J. Geng ◽  
Y. F. Huang
Keyword(s):  
Black Holes ◽  
Numerical Method ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Shock Model ◽  
Reverse Shock ◽  
X Ray ◽  
Electron Positron ◽  
Forward Shock ◽  
Electron Positron Pair

The detection of optical rebrightenings and X-ray plateaus in the afterglows of gamma-ray bursts (GRBs) challenges the generic external shock model. Recently, we have developed a numerical method to calculate the dynamics of the system consisting of a forward shock and a reverse shock. Here, we briefly review the applications of this method in the afterglow theory. By relating these diverse features to the central engines of GRBs, we find that the steep optical rebrightenings would be caused by the fall-back accretion of black holes, while the shallow optical rebrightenings are the consequence of the injection of the electron-positron-pair wind from the central magnetar. These studies provide useful ways to probe the characteristics of GRB central engines.

scholarly journals Derivative corrections to the Heisenberg-Euler effective action

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Felix Karbstein
Keyword(s):  
Electric Fields ◽  
Effective Action ◽  
Vacuum Polarization ◽  
Strong Field ◽  
Background Field ◽  
Polarization Tensor ◽  
Quantum Vacuum ◽  
Electron Positron ◽  
Vacuum Polarization Tensor ◽  
Electron Positron Pair

Abstract We show that the leading derivative corrections to the Heisenberg-Euler effective action can be determined efficiently from the vacuum polarization tensor evaluated in a homogeneous constant background field. After deriving the explicit parameter-integral representation for the leading derivative corrections in generic electromagnetic fields at one loop, we specialize to the cases of magnetic- and electric-like field configurations characterized by the vanishing of one of the secular invariants of the electromagnetic field. In these cases, closed-form results and the associated all-orders weak- and strong-field expansions can be worked out. One immediate application is the leading derivative correction to the renowned Schwinger-formula describing the decay of the quantum vacuum via electron-positron pair production in slowly-varying electric fields.

Sign in / Sign up

Export Citation Format

Share Document