How big are branes?
JUL 10, 2009
DOI: 10.1063/PT.5.023497
Science News : A team of theoretical physicists and astronomers has calculated that any hidden extra dimension beyond our familiar three-dimensional space, a world known in physics parlance as a 3-brane, must be less than 3 micrometers. The researchers base their findings on the recent discovery of one of the smallest and oldest black holes ever found.The new limit is less than half that of previous limits on the length of an extra dimension, Oleg Gnedin of the University of Michigan in Ann Arbor and his colleagues report in a study posted online 30 June ( http://arxiv.org/abs/0906.5351 ).
© 2009 American Institute of Physics
