Most of the matter in the universe may be made out of
particles that possess an unusual, donut-shaped electromagnetic field called an
anapole.
This proposal, which endows dark matter particles with a
rare form of electromagnetism, has been strengthened by a detailed analysis
performed by a pair of theoretical physicists at Vanderbilt University:
Professor Robert Scherrer and post-doctoral fellow Chiu Man Ho. An article
about the research was published online last month by the journal Physics
Letters B.