Estimate of the primordial magnetic field helicity

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18 Scopus citations


Electroweak baryogenesis proceeds via changes in the non-Abelian Chern-Simons number. It is argued that these changes generate a primordial magnetic field with left-handed helicity. The helicity density of the primordial magnetic field today is then estimated to be given by ∼102nb where nb∼10-6 /cm3 is the present cosmological baryon number density. With certain assumptions about the inverse cascade we find that the field strength at recombination is ∼10--13 G on a comoving coherence scale ∼0.1 pc.

Original languageEnglish (US)
Pages (from-to)251302-1-251302-4
JournalPhysical Review Letters
Issue number25
StatePublished - Dec 17 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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