At http://phys.org/print290089874.html … most of the matter in the universe may be made out of particles with a doughnut shaped electromagnetic field known as an anapole. This hypothesis endows dark matter with electromagnetism and the research is published in the journal Physics Letters B (see also adsabs.harvard.edu/abs/2013PhLB..722…341H).
Dark matter was proposed as long ago as the 1930s in order to explain discrepancies in the rotational rate of galactic clusters. Astronomers have since found problems in the way that stars rotate around individual galaxies. For example, stars far from the centre of galaxies are moving at migh higher velocities than can be explained by the amount of visible matter – and assume there is a large quantity of invisible dark matter to explain the anomalies.
Astronomical observations have ruled out that dark matter carries an electrical charge – it cannot be seen in telescopes as it does not interact with light and electromagnetic radiation. However, particles with electric and magnetic dipoles interact with electromagnetic fields but particles with anapole fields do not (when stationary). They do interact, it is thought, when moving, and the faster they move the more interactive they become. What this theory relies on, it would seem, is that dark matter was super active at Big Bang but has become much less active as the universe expanded and cooled – until now, where activity is absent. Does this theory have legs?