Superconducting p-branes and extremal black holes

In Einstein-Maxwell theory, magnetic flux lines are ‘expelled’ from a black hole as extremality is approached, in the sense that the component of the field strength normal to the horizon goes to zero. Thus, extremal black holes are found to exhibit the sort of ‘Meissner effect’ which is characteristic of superconducting media. We review some of the evidence… CONTINUE READING