Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-21
JCAP0802:001,2008
Astronomy and Astrophysics
Astrophysics
10 figures; v3: small typos corrected to match published version. MagnetiCS, the code described in paper, is available at ht
Scientific paper
10.1088/1475-7516/2008/02/001
Large-scale coherent magnetic fields are observed in galaxies and clusters, but their ultimate origin remains a mystery. We reconsider the prospects for primordial magnetogenesis by a cosmic string network. We show that the magnetic flux produced by long strings has been overestimated in the past, and give improved estimates. We also compute the fields created by the loop population, and find that it gives the dominant contribution to the total magnetic field strength on present-day galactic scales. We present numerical results obtained by evolving semi-analytic models of string networks (including both one-scale and velocity-dependent one-scale models) in a Lambda-CDM cosmology, including the forces and torques on loops from Hubble redshifting, dynamical friction, and gravitational wave emission. Our predictions include the magnetic field strength as a function of correlation length, as well as the volume covered by magnetic fields. We conclude that string networks could account for magnetic fields on galactic scales, but only if coupled with an efficient dynamo amplification mechanism.
Battefeld Diana
Battefeld Thorsten
Wesley Daniel H.
Wyman Mark
No associations
LandOfFree
Magnetogenesis from Cosmic String Loops does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetogenesis from Cosmic String Loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetogenesis from Cosmic String Loops will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-367554