Leptogenesis and primordial magnetic fields

Andrew J. Long, Eray Sabancilar, Tanmay Vachaspati

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The anomalous conversion of leptons into baryons during leptogenesis is shown to produce a right-handed helical magnetic field; in contrast, the magnetic field produced during electroweak baryogenesis is known to be left-handed. If the cosmological medium is turbulent, the magnetic field evolves to have a present day coherence scale ∼ 10 pc and field strength ∼ 10-18 Gauss. This result is insensitive to the energy scale at which leptogenesis took place. Observations of the amplitude, coherence scale, and helicity of the intergalactic magnetic field promise to provide a powerful probe of physics beyond the Standard Model and the very early universe.

Original languageEnglish (US)
Article number036
JournalJournal of Cosmology and Astroparticle Physics
Issue number2
StatePublished - Feb 2014


  • cosmic magnetic fields theory
  • leptogenesis
  • particle physics - cosmology connection
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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