Primordial magnetic fields from metric perturbations | Zendy

Antonio L. Maroto | Zendy

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Primordial magnetic fields from metric perturbations

Author(s) -

Antonio L. Maroto

Publication year - 2001

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Language(s) - English

Resource type - Journals

eISSN - 1089-4918

pISSN - 0556-2821

DOI - 10.1103/physrevd.64.083006

Subject(s) - metric (unit) , physics , magnetic field , mathematics , quantum mechanics , engineering , operations management

We study the amplification of electromagnetic vacuum fluctuations induced by the evolution of scalar metric perturbations at the end of inflation. Such perturbations break the conformal invariance of Maxwell equations in Friedmann-Robertson-Walker backgrounds and allow the growth of magnetic fields on super-Hubble scales. We relate the strength of the fields generated by this mechanism with the power spectrum of scalar perturbations and estimate the amplification on galactic scales for different values of the spectral index. Finally we discuss the possible effects of finite conductivity during reheating

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