Sliding rings and spinning holes
Abstract
We construct smooth supergravity solutions describing a BPS black ring with a BPS black hole centered at an arbitrary distance above the ring. We find that as one moves the black hole the entropy of the ring remains constant, but the angular momentum coming from the supergravity fluxes changes. Our solutions also show that in order to merge a BPS black ring with a BPS black hole one has to increase one of the angular momenta of the ring, and that the result of the merger is always a BMPV black hole. We also find a class of mergers that are thermodynamically reversible, and comment on their physics.
 Publication:

Journal of High Energy Physics
 Pub Date:
 May 2006
 DOI:
 10.1088/11266708/2006/05/075
 arXiv:
 arXiv:hepth/0512157
 Bibcode:
 2006JHEP...05..075B
 Keywords:

 High Energy Physics  Theory
 EPrint:
 26 pages, harvmac