Magnetic field transfer from a hidden sector

Kohei Kamada, Yuhsin Tsai, Tanmay Vachaspati

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Primordial magnetic fields in the dark sector can be transferred to magnetic fields in the visible sector due to a gauge kinetic mixing term. We show that the transfer occurs when the evolution of magnetic fields is dominated by dissipation due to finite electric conductivity, and does not occur at later times if the magnetic fields evolve according to magnetohydrodynamics scaling laws. The efficiency of the transfer is suppressed by not only the gauge kinetic mixing coupling but also the ratio between the large electric conductivity and the typical momentum of the magnetic fields. We find that the transfer gives nonzero visible magnetic fields today. However, without possible dynamo amplifications, the field transfer is not efficient enough to obtain the intergalactic magnetic fields suggested by the gamma-ray observations, although there are plenty of possibilities for efficient dark magnetogenesis, which are experimentally unconstrained.

Original languageEnglish (US)
Article number043501
JournalPhysical Review D
Issue number4
StatePublished - Aug 15 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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