How the universe's first magnetic field formed
The first-ever magnetic fields in the universe arose within 370,000 years of the big bang, a new analysis suggests. The work relies on standard physics, unlike some previous theories, and may shed light on how the very first stars grew.
Relatively confined magnetic fields like those in the Earth and Sun are generated by the turbulent mixing of conducting fluids in their cores. But large-scale fields tangled within galaxies and clusters of galaxies are harder to explain by fluid mixing alone. That is because most galaxies have rotated only a few dozen times since they formed.
"The galaxies have not made a lot of rotations during their whole existence, so it's not clear how much amplification one can get," says Dam Thanh Son at the University of Washington in Seattle, US, who was not involved in the new study. "One needs some initial, small magnetic field.".....Read on ....http://space.newscientist.com/article.ns?id=dn8544
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