The Efficiency of CP-Violating α2-Dynamos from Primordial Cosmic Axion Oscillation with TorsionReport as inadecuate




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Recentlytorsion fields were introduced in CP-violating cosmic axion a2-dynamosGarcia de Andrade, Mod Phys Lett A, 2011 in order to obtain Lorentzviolating bounds for torsion. Here instead, oscillating axion solutions of thedynamo equation with torsion modes Garcia de Andrade, Phys Lett B 2012 areobtained taking into account dissipative torsion fields. Magnetic helicitytorsion oscillatory contribution is also obtained. Note that the torsion presenceguarantees dynamo efficiency when axion dynamo length is much stronger than thetorsion length. Primordial axion oscillations due to torsion yield a magneticfield of 109 G at Nucleosynthesis epoch. This is obtained due to adecay of BBN magnetic field of 1015 G induced by torsion. Sincetorsion is taken as 10–20 s–1, the dynamo efficiency isgranted over torsion damping. Of course dynamo efficiency is better in theabsence of torsion. In the particular case when the torsion is obtained fromanomalies it is given by the gradient of axion scalar Duncan et al., Nuclear Phys B 87, 215 that asimpler dynamo equation is obtained and dynamo mechanism seems to be efficientwhen the torsion helicity, is negative while magnetic field decays when thetorsion is positive. In this case an extremely huge value for the magneticfield of 1015 Gauss is obtained. This is one order of magnitudegreater than the primordial magnetic fields of the domain wall. Actually if oneuses tDW ~ 10-4 s one obtains BDW ~ 1022 G which is amore stringent limit to the DW magnetic primordial field.

KEYWORDS

Torsion Theories, Axion Dynamo, Primordial Magnetic Fields

Cite this paper

Andrade, L. 2015 The Efficiency of CP-Violating α2-Dynamos from Primordial Cosmic Axion Oscillation with Torsion. International Journal of Astronomy and Astrophysics, 5, 56-59. doi: 10.4236-ijaa.2015.51008.





Author: L. C. Garcia de Andrade*

Source: http://www.scirp.org/



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