Volume 100, Number 1, October 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 October 2012|
Euler-Heisenberg Lagrangian and photon circular polarization
1 Department of Physics, Mashhad Branch, Islamic Azad University - Mashhad, Iran
2 ICRANet - P.zza della Repubblica 10, I-65122 Pescara, Italy, EU
3 Physics Department, University of Rome “La Sapienza” - Rome, Italy, EU
Received: 24 May 2012
Accepted: 11 September 2012
Considering the effective Euler-Heisenberg Lagrangian, i.e., nonlinear photon-photon interactions, we study the circular polarization of electromagnetic radiation based on the time evolution of Stokes parameters. To the leading order, we solve the quantum Boltzmann equation for the density matrix describing an ensemble of photons in the space of energy-momentum and polarization states, and calculate the intensity of circular polarizations. Applying these results to a linear polarized thermal radiation, we calculate the circular-polarization intensity, and discuss its possible relevance to the circular polarization intensity of the cosmic microwave background radiation.
PACS: 73.50.Fq – High-field and nonlinear effects / 42.50.Xa – Optical tests of quantum theory / 98.70.Vc – Background radiations
© EPLA, 2012
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