Garcia de Andrade 2011 利用法拉第旋转来限制洛仑兹违背

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Title:		Faraday rotation and primordial magnetic field constraints on Ultraviolet Lorentz violation with spacetime torsion
Authors:		Garcia de Andrade, L C
Publication:		eprint arXiv:1105.1573
Publication Date:		05/2011
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics, General Relativity and Quantum Cosmology
Comment:		Departamento de fisica teorica-Universidade do Estado do Rio de Janeiro-UERJ
Bibliographic Code:		2011arXiv1105.1573G

Abstract

Recently Kahniashivili et al (2006) presented a unified treatment for ultraviolet Lorentz violation (LV) testing through electromagnetic wave propagation in magnetised plasmas, based on dispersion and rotation measured data. Based on the fact discovered recently by Kostelecky et al (2008), that LV may place constraints on spacetime torsion, in this paper it is shown that on the limit of very low frequency torsion waves, it is possible to constraint torsion from Faraday rotation and CMB on a similar fashion as Minkowski spacetime plus torsion. Here the Maxwells modified equations are obtained by a perturbative method introduced by de Sabbata and Gasperini (1981). Torsion is constraint to $Q_{CMB}\approx{10^{-18}GeV}$ which is not so stringent as the $10^{-31}GeV$ obtained by Kostelecky et al. However, Gamma Ray Bursts (GBRs) may lead to the more string value obtined by Kostelecky et al. Another interesting constraint on torsion is shown to be placed by galactic dynamo seed magnetic fields. For torsion effects be compatible with the galactic dynamo seeds one obtains a torsion constraint of $10^{-33}GeV$ which is two orders of magnitude more stringent that the above Kostelecky et al limit.

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