Nonlinear electrodynamics and CMB polarization

作者：Mosquera Cuesta Herman J; Lambiase G

来源：Journal of Cosmology and Astroparticle Physics, 2011, (3): 033.

DOI：10.1088/1475-7516/2011/03/033

• CMBR polarisation
• CMBR theory
• extragalactic magnetic fields
• cosmic magnetic fields theory

Recently WMAP and BOOMERanG experiments have set stringent constraints on the polarization angle of photons propagating in an expanding universe: Delta alpha = (-2.4 +/- 1.9)degrees. 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 L similar to (X/Lambda(4))(delta-1) X, where X = 1/4F(alpha beta)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

• 出版日期2011-3