Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories

Kazuharu Bamba, Nobuyoshi Ohta, Shinji Tsujikawa

Research output: Contribution to journalArticle

38 Citations (Scopus)

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 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.

Original languageEnglish
Article number043524
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number4
DOIs
Publication statusPublished - 2008 Aug 14
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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