Lorentz violation from torsion trace and non-minimal coupling in radio galactic dynamos

Details Lorentz violation from torsion trace and non-minimal coupling in radio galactic dynamos Lorentz violation from torsion trace and non-minimal coupling in radio galactic dynamos

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvd..84l7504g&link_type=abstract

Physical Review D, vol. 84, Issue 12, id. 127504

Astronomy and Astrophysics

Astronomy

1

Modified Theories Of Gravity, Lorentz And Poincare Invariance, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

Earlier Kostelecky et al. [A. Kostelecky, N. Russell, and J. Tasson, Phys Rev Lett 100, 111102 (2008).PRLTAO0031-900710.1103/PhysRevLett.100.111102] have obtained torsion bounds from Lorentz violation, where torsion components are taken from the axial part of torsion. In this brief report it is shown that more stringent bounds may be obtained by using nearly minimal magnetogenesis torsion trace instead of the minimal coupling between photons and axial torsion used by Kostelecky and his group. Just for comparison, in Kostelecky et al., the most stringent limit is estimated to be 10-31GeV while here one obtains 10-33GeV. This estimate is obtained by constraining the torsion to galactic astronomy data. From the point of view of magnetogenesis, an interesting physical consequence is that dynamo action is obtained when the torsion trace background is negative, while the magnetic field energy decays when torsion is positive. Polarization of radio-galaxies can be used to obtain an even more stringent limit of T˜1.7×10-46GeV to Lorentz violation. Using WMAP, Kostelecky and Mewes [A. Kostelecky and M. Mewes, Astrophys. J. 689, L1 (2008)ASJOAB0004-637X10.1086/595815] have found limits of the order of 10-43GeV. These results are obtained by making use of flat torsion modes [L. Garcia de Andrade, Phys Lett B 696, 1 (2011)], but may easily be extended to Riemann-Cartan spacetime.

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