Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-10-12
Phys.Rev. D71 (2005) 103509
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex, 16 pages, 2 figures, 4 references added, minor corrections; v4: more references added, boundary term written in a covar
Scientific paper
10.1103/PhysRevD.71.103509
Inflation has the potential to seed the galactic magnetic fields observed today. However, there is an obstacle to the amplification of the quantum fluctuations of the electromagnetic field during inflation: namely the conformal invariance of electromagnetic theory on a conformally flat underlying geometry. As the existence of a preferred minimal length breaks the conformal invariance of the background geometry, it is plausible that this effect could generate some electromagnetic field amplification. We show that this scenario is equivalent to endowing the photon with a large negative mass during inflation. This effective mass is negligibly small in a radiation and matter dominated universe. Depending on the value of the free parameter of the theory, we show that the seed required by the dynamo mechanism can be generated. We also show that this mechanism can produce the requisite galactic magnetic field without resorting to a dynamo mechanism.
Ashoorioon Amjad
Mann Robert B.
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