Estimate of the primordial magnetic field helicity

Tanmay Vachaspati

doi:10.1103/PhysRevLett.87.251302

Estimate of the primordial magnetic field helicity

Tanmay Vachaspati

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

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 ∼10²n_b where n_b∼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 language	English (US)
Pages (from-to)	251302-1-251302-4
Journal	Physical Review Letters
Volume	87
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.87.251302
State	Published - Dec 17 2001
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.87.251302

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title = "Estimate of the primordial magnetic field helicity",

abstract = "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.",

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AB - 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.

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Estimate of the primordial magnetic field helicity

Abstract

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