Journal
PHYSICAL REVIEW D
Volume 78, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.043524
Keywords
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Funding
- Kinki University
- National Tsing Hua University [97N2309F1]
- JSPS [20540283, 06042, 30318802]
- Japan-U.K. Research Cooperative Program
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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 ultrarelativistic 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.
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