Inflation-produced, large-scale magnetic fields

Details Inflation-produced, large-scale magnetic fields Inflation-produced, large-scale magnetic fields

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvd..37.2743t&link_type=abstract

Physical Review D (Particles and Fields), Volume 37, Issue 10, 15 May 1988, pp.2743-2754

Astronomy and Astrophysics

Astrophysics

423

Particle-Theory And Field-Theory Models Of The Early Universe, Magnetohydrodynamics And Plasmas

Scientific paper

We study the production of large-scale (~Mpc) magnetic fields in inflationary Universe models. The magnetic fields produced are uninterestingly small unless the conformal invariance of the electromagnetic field is broken. Once the conformal invariance is broken, a mechanism akin to ``superadiabatic amplification'' can operate and lead to sizable primeval magnetic fields. We consider three ways of breaking the conformal invariance: through gravitational couplings of the photon; through the coupling of the photon to a charged massless, nonconformally invariant scalar field; and through the anomalous coupling of the photon to axions. The primeval magnetic fields which result can have astrophysically interesting strengths, but are very model dependent.

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