In particular from wiki: Proponents of plasma cosmology claim electrodynamics is as important as gravity in explaining the structure of the universe, and speculate that it provides an alternative explanation for the evolution of galaxies<http://en.wikipedia.org/wiki/Galaxy_formation_and_evolution> [8] <http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Peratt1986-8> and the initial collapse of interstellar clouds.[19]<http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Alfven1978-19> In particular plasma cosmology is claimed to provide an alternative explanation for the flat rotation curves<http://en.wikipedia.org/wiki/Galaxy_rotation_curve> of spiral galaxies and to do away with the need for dark matter<http://en.wikipedia.org/wiki/Dark_matter> in galaxies and with the need for supermassive black holes<http://en.wikipedia.org/wiki/Supermassive_black_holes> in galaxy centres to power quasars <http://en.wikipedia.org/wiki/Quasars> and active galactic nuclei <http://en.wikipedia.org/wiki/Active_galactic_nucleus>.[8]<http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Peratt1986-8> [37] <http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Peratt1983-37> This is controversial, as theoretical analysis shows that "many scenarios for the generation of seed magnetic fields, which rely on the survival and sustainability of currents at early times [of the universe are disfavored]", [20] <http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Siegel2006-20> i.e. Birkeland currents of the magnitude needed (say 1018 Amps) for galaxy formation are thought to not exist.[16]<http://en.wikipedia.org/wiki/Plasma_cosmology#cite_note-Colafrancesco2006-16>
On Sun, Jan 20, 2013 at 1:57 PM, Giovanni Santostasi <[email protected]>wrote: > See this entry in wiki: > > http://en.wikipedia.org/wiki/Plasma_cosmology > > Giovanni > > > On Sun, Jan 20, 2013 at 1:45 PM, Giovanni Santostasi < > [email protected]> wrote: > >> Astronomers are aware of Alfven's work. I have myself few books that are >> written by him and some of his students. >> >> As I said modern astrophysics models do indeed include EM fields in >> simulations of stellar formation, planetary disks, galactic collisions and >> so on. >> There are interesting things to learn from this but they are usually >> small effects and they don't take away the leading role of gravity at large >> scales. >> >> Also we are talking about the electrical and magnetic properties of >> plasma and not some magnetic iron dust magnetized particles. While yes, >> magnetism is important in our understanding of astrophysical process it is >> not a direct non trivial contribution but more of a subtle effect. >> >> http://www.wired.com/wiredscience/2012/01/galaxy-magnetism-lab-simulation/ >> >> Giovanni >> >> >> >> On Sun, Jan 20, 2013 at 12:45 PM, <[email protected]> wrote: >> >>> In reply to David Roberson's message of Sun, 20 Jan 2013 11:55:12 -0500 >>> (EST): >>> Hi Dave, >>> [snip] >>> >>> See http://www.youtube.com/watch?v=5BLPvs3JTyA . >>> >>> Regards, >>> >>> Robin van Spaandonk >>> >>> http://rvanspaa.freehostia.com/project.html >>> >>> >> >
