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- W3100667709 endingPage "033" @default.
- W3100667709 startingPage "033" @default.
- W3100667709 abstract "Recently WMAP and BOOMERanG experiments have set stringent constraints on the polarization angle of photons propagating in an expanding universe: $Delta alpha = (-2.4 pm 1.9)^circ$. The polarization of the Cosmic Microwave Background radiation (CMB) is reviewed in the context of nonlinear electrodynamics (NLED). We compute the polarization angle of photons propagating in a cosmological background with planar symmetry. For this purpose, we use the Pagels-Tomboulis (PT) Lagrangian density describing NLED, which has the form $Lsim (X/Lambda^4)^{delta - 1}; X $, where $X=1/4 F_{alphabeta} F^{alpha beta}$, and $delta$ the parameter featuring the non-Maxwellian character of the PT nonlinear description of the electromagnetic interaction. After looking at the polarization components in the plane orthogonal to the ($x$)-direction of propagation of the CMB photons, the polarization angle is defined in terms of the eccentricity of the universe, a geometrical property whose evolution on cosmic time (from the last scattering surface to the present) is constrained by the strength of magnetic fields over extragalactic distances." @default.
- W3100667709 created "2020-11-23" @default.
- W3100667709 creator A5026604330 @default.
- W3100667709 creator A5050600153 @default.
- W3100667709 date "2011-03-22" @default.
- W3100667709 modified "2023-10-13" @default.
- W3100667709 title "Nonlinear electrodynamics and CMB polarization" @default.
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