scholarly journals Photon polarization tensor on deformed spacetime: A four-photon-tadpole contribution

2016 ◽  
Author(s):  
Jiangyang You ◽  
Josip Trampetic ◽  
Raul Horvat
Keyword(s):  
Polarization Tensor ◽  
Photon Polarization

Photon polarization tensor and gauge dependence in three-dimensional quantum electrodynamics

1992 ◽  
Vol 46 (6) ◽  
pp. 2695-2702 ◽  
Author(s):  
Conrad J. Burden ◽  
Justin Praschifka ◽  
Craig D. Roberts
Keyword(s):  
Quantum Electrodynamics ◽  
Three Dimensional ◽  
Polarization Tensor ◽  
Photon Polarization ◽  
Gauge Dependence

scholarly journals OPTICAL PROBES OF THE QUANTUM VACUUM: THE PHOTON POLARIZATION TENSOR IN EXTERNAL FIELDS

2012 ◽  
Vol 14 ◽  
pp. 403-415 ◽  
Author(s):  
FELIX KARBSTEIN ◽  
LARS ROESSLER ◽  
BABETTE DÖBRICH ◽  
HOLGER GIES
Keyword(s):  
Electromagnetic Fields ◽  
Effective Theory ◽  
Constant Field ◽  
Momentum Dependence ◽  
Polarization Tensor ◽  
Quantum Vacuum ◽  
Vacuum Fluctuations ◽  
Photon Polarization ◽  
Photon Propagation ◽  
External Electromagnetic Fields

The photon polarization tensor is the central building block of an effective theory description of photon propagation in the quantum vacuum. It accounts for the vacuum fluctuations of the underlying theory, and in the presence of external electromagnetic fields, gives rise to such striking phenomena as vacuum birefringence and dichroism. Standard approximations of the polarization tensor are often restricted to on-the-light-cone dynamics in homogeneous electromagnetic fields, and are limited to certain momentum regimes only. We devise two different strategies to go beyond these limitations: First, we aim at obtaining novel analytical insights into the photon polarization tensor for homogeneous fields, while retaining its full momentum dependence. Second, we employ wordline numerical methods to surpass the constant-field limit.

scholarly journals Photon polarization tensor in circularly polarized Hermite- and Laguerre-Gaussian beams

2018 ◽  
Vol 33 (07n08) ◽  
pp. 1850044 ◽  
Author(s):  
Felix Karbstein ◽  
Elena A. Mosman
Keyword(s):  
Quantum Electrodynamics ◽  
Field Approximation ◽  
Constant Field ◽  
Polarization Tensor ◽  
Photon Polarization ◽  
Circularly Polarized ◽  
Polarized Beams ◽  
Effective Lagrangian ◽  
Linearly Polarized ◽  
The One

We derive analytical expressions for the photon polarization tensor in circularly polarized Hermite-Gaussian (HG) and Laguerre-Gaussian (LG) beams, complementing the corresponding results for linearly polarized beams obtained recently. As they are based upon a locally constant field approximation of the one-loop Heisenberg–Euler effective Lagrangian for quantum electrodynamics (QED) in constant fields, our results are generically limited to slowly varying electromagnetic fields, varying on spatial (temporal) scales much larger than the Compton wavelength (time) of the electron.

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