2010/07/11 by Garcia de Andrade, de Andrade, Garcia
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Quantum Electrodynamics and Casimir Effect #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.1007.1803
openalex publication_date 2010/07/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Dynamo action is shown to be induced from homogeneous non-minimal\nphoton-torsion axial coupling in the quantum electrodynamics (QED) framework in\nRiemann flat spacetime contortion decays. The geometrical optics in\nRiemann-Cartan spacetime is considering and a plane wave expansion of the\nelectromagnetic vector potential is considered leading to a set of the\nequations for the ray congruence. Since we are interested mainly on the torsion\neffects in this first report we just consider the Riemann-flat case composed of\nthe Minkowskian spacetime with torsion. It is also shown that in torsionic de\nSitter background the vacuum polarisation does alter the propagation of\nindividual photons, an effect which is absent in Riemannian spaces. It is shown\nthat the cosmological torsion background inhomogeneities induce Lorentz\nviolation and massive photon modes in this QED. Magnetic dynamos in this\ntorsioned spacetime electrodynamics are simpler obtained in Fourier space than\nthe cosmic ones, previously obtained by Bassett et al Phys Rev D, in Friedmann\nuniverse. By deriving plasma dispersion for linear electrodynamics in Riemann\nCartan spacetime, dynamo action seems to be possible for plasma frequencies in\nsome polarizations. The important cosmic magnetic field problem of breaking\nconformal flatness is naturally solved here since the photon torsion coupling\nbreaks conformal flatness.\n