43 research outputs found
Extremal limit for charged and rotating 2+1-dimensional black holes and Bertotti-Robinson geometry
We consider 2+1--dimensional analogues of the Bertotti-Robinson (BR)
spacetimes in the sense that the coefficient at the angular part is a constant.
We show that such BR-like solutions are either pure static or uncharged
rotating. We trace the origin of the inconsistency between a charge and
rotation, considering the BR-like spacetime as a result of the limiting
transition of a non-extremal black hole to the extremal state. We also find
that the quasilocal energy and angular momentum of such BR-like spacetimes
calculated within the boundary ( is the proper distance) are
constants independent of the position of the boundary.Comment: Presentation simplified. To appear in CQ