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Author Bamba, Kazuharu ♦ Ohta, Nobuyoshi ♦ Tsujikawa, Shinji
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-05-25
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics ♦ General Relativity and Quantum Cosmology ♦ High Energy Physics - Phenomenology ♦ High Energy Physics - Theory ♦ physics:astro-ph ♦ physics:gr-qc ♦ physics:hep-ph ♦ physics:hep-th
Abstract We estimate the strength of large-scale magnetic fields produced during inflation in the framework of Dirac-Born-Infeld (DBI) theories. This analysis is sufficiently general in the sense that it covers most of conformal symmetry breaking theories in which the electromagnetic field is coupled to a scalar field. In DBI theories there is an additional factor associated with the speed of sound, which allows a possibility to lead to an extra amplification of the magnetic field in a ultra-relativistic region. We clarify the conditions under which seed magnetic fields to feed the galactic dynamo mechanism at a decoupling epoch as well as present magnetic fields on galactic scales are sufficiently generated to satisfy observational bounds.
Description Comment: 7 pages, no figure, accepted in Phys. Rev. D
Reference: Phys.Rev.D78:043524,2008
Educational Use Research
Learning Resource Type Article
Page Count 7


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