Phase Transition Generated Cosmological Magnetic Field at Large Scales

Phase Transition Generated Cosmological Magnetic Field at Large Scales

We constrain a primordial magnetic field (PMF) generated during a phase transition (PT) using the big bang nucleosynthesis bound on the relativistic energy density. The amplitude of the PMF at large scales is determined by the shape of the PMF spectrum outside its maximal correlation length scale. E...

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Veröffentlicht in:The Astrophysical journal 2011-01, Vol.726 (2), p.78-jQuery1323911952083='47'
Hauptverfasser: Kahniashvili, Tina, Tevzadze, Alexander G, Ratra, Bharat
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMIC RADIATION
Earth, ocean, space
Exact sciences and technology
GRAVITATIONAL WAVES
IONIZING RADIATIONS
MAGNETIC FIELDS
NUCLEOSYNTHESIS
PHASE TRANSFORMATIONS
RADIATIONS
SYNTHESIS
UNIVERSE
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Beschreibung
Zusammenfassung:We constrain a primordial magnetic field (PMF) generated during a phase transition (PT) using the big bang nucleosynthesis bound on the relativistic energy density. The amplitude of the PMF at large scales is determined by the shape of the PMF spectrum outside its maximal correlation length scale. Even if the amplitude of the PMF at 1 Mpc is small, PT-generated PMFs can leave observable signatures in the potentially detectable relic gravitational wave background if a large enough fraction (1%-10%) of the thermal energy is converted into the PMF.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/726/2/78