Estimate of the primordial magnetic field helicity

Tanmay Vachaspati

Estimate of the primordial magnetic field helicity

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

Abstract

A scenario that allows to estimate the net helicity of the galactic magnetic field is presented. Both magnetic helicity and baryon number are conserved during galaxy formation when the protogalactic cloud collapses. During this collapse, the helicity and baryon densities increase due to the decrease in the cloud volume, but the ratio of the helicity density to the baryon density remains unchanged. Hence the helicity density of the galactic magnetic field can be estimated to be ∼ -10²n_{b, gal} ∼ -10/cm³.

Original language	English (US)
Article number	251302
Pages (from-to)	251302/1-251302/4
Journal	Physical Review Letters
Volume	87
Issue number	25
State	Published - Dec 17 2001
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

Cite this

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

abstract = "A scenario that allows to estimate the net helicity of the galactic magnetic field is presented. Both magnetic helicity and baryon number are conserved during galaxy formation when the protogalactic cloud collapses. During this collapse, the helicity and baryon densities increase due to the decrease in the cloud volume, but the ratio of the helicity density to the baryon density remains unchanged. Hence the helicity density of the galactic magnetic field can be estimated to be ∼ -102nb, gal ∼ -10/cm3.",

author = "Tanmay Vachaspati",

year = "2001",

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day = "17",

language = "English (US)",

volume = "87",

pages = "251302/1--251302/4",

journal = "Physical Review Letters",

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N2 - A scenario that allows to estimate the net helicity of the galactic magnetic field is presented. Both magnetic helicity and baryon number are conserved during galaxy formation when the protogalactic cloud collapses. During this collapse, the helicity and baryon densities increase due to the decrease in the cloud volume, but the ratio of the helicity density to the baryon density remains unchanged. Hence the helicity density of the galactic magnetic field can be estimated to be ∼ -102nb, gal ∼ -10/cm3.

AB - A scenario that allows to estimate the net helicity of the galactic magnetic field is presented. Both magnetic helicity and baryon number are conserved during galaxy formation when the protogalactic cloud collapses. During this collapse, the helicity and baryon densities increase due to the decrease in the cloud volume, but the ratio of the helicity density to the baryon density remains unchanged. Hence the helicity density of the galactic magnetic field can be estimated to be ∼ -102nb, gal ∼ -10/cm3.

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AN - SCOPUS:45849155453

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Estimate of the primordial magnetic field helicity

Abstract

ASJC Scopus subject areas

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