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

Kazuharu Bamba*, Nobuyoshi Ohta, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

40 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号043524
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
78
4
DOI
出版ステータスPublished - 2008 8 14
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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