Where Do We Stand on the Origin of Cosmic Magnetic Fields?

Details Where Do We Stand on the Origin of Cosmic Magnetic Fields? Where Do We Stand on the Origin of Cosmic Magnetic Fields?

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..apr.b7005k&link_type=abstract

American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #B7.005

Physics

Scientific paper

I will discuss two possible origins for cosmic magnetic fields. First, the origin in the protostructures driven by gravitational instabilities produced by gravitational collapse. I will show that on the basis of a cascade it is possible to produce larges scale strong magnetic fields. These fields can provide the seed fields for galaxies and clusters of galaxies, or even provide a primordial origin for them. Second, I will discuss the classical alpha omega dynamo origin for galactic fields. I will stress a major difficulty with them. Namely, the necessity for these dynamos to get rid of flux by expulsion from the galactic disks. I will discuss the major difficulties associated with this expulsion of matter loaded lines of force escaping from the very deep gravitational well. I will finally compare the likelyhood of these two dynamos for the creation of cosmic magnetic fields.

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