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>STRINGENT LIMITS FOR THE MAGNETIC FIELD FROM EARLY UNIVERSE DYNAMOS IN RF2 COSMOLOGY WITH TORSION | Science Publications
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STRINGENT LIMITS FOR THE MAGNETIC FIELD FROM EARLY UNIVERSE DYNAMOS IN RF2 COSMOLOGY WITH TORSION | Science Publications
> Bamba et al. (2012) have obtained cosmological magnetic fields in teleparallel torsion theories of gravity that are not compatible with galactic dynamos. This result agrees with previous ones obtained by the author which shows Garcia de Andrade (1999) that anti-dynamo generalised theorem to torsion theories forbides such kind of dynamos to explain galactic magnetic fields of the order of ?G. More recently the author has suggested Garcia de Andrade (2012) that a sort of Biermann battery could be obtained in torsioned cosmology. Nevertheless in this study we show that this can be a particular result, since the second author did not took into account mean field dynamo equations in torsion field background. Actually it is shown that amplification or not of the magnetic field depends upon handness sign of the torsion field vector. It is shown that density fluctuations of spin-torsion density implies also a possibility of amplification of the cosmic magnetic fields. From WMAP data it is possible to estimate the spin-torsion fluctuation as 10?6 which represents an order of magnitude lower than the matter density. By making use of the gravitational couling of type RF2 one obtains 1037G for the Planck era magnetic field, which is a much more stringent limit than the ones obtained earlier. The magnetic field obtained today is 10?23G is obtained which is able to seed galactic dynamos.
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机译： > Bamba 等。 （2012）已经获得了远心平行引力理论中与银河动力不兼容的宇宙磁场。这一结果与作者先前的研究结果一致，后者显示了加西亚·德·安德拉德（Garcia de Andrade（1999）），将反发电机泛化定理转化为扭转理论，从而禁止这种发电机来解释？G 的银河磁场。 。最近，作者建议加西亚·德·安德拉德（Garcia de Andrade，2012）认为，在扭曲宇宙学中可以得到一种Biermann电池。然而，在本研究中，我们表明这可能是一个特殊的结果，因为第二作者没有考虑扭转场背景下的平均场发电机方程。实际上表明，磁场的放大与否取决于扭转场矢量的惯性符号。结果表明，自旋扭转密度的密度波动还暗示了宇宙磁场放大的可能性。根据WMAP数据，可以将自旋扭转波动估计为10 ？6 ，这表示比物质密度低一个数量级。通过使用类型为 RF 2 的重力耦合，人们可以获得普朗克时代磁场的1037 G ，这是更严格的限制比早先获得的今天获得的磁场为10 ？23 G ，该磁场能够播种银河系发电机。
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