1995/12/31 by Ramzi R. Khuri, Ramzi Khuri, Tomás Ortı́n +1 · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-th
paper · pdf · doi:10.1016/0550-3213(96)00112-5
published as Nucl.Phys.B467:355-382,1996 · A few references and comments have been added
arxiv created 1996/02/02 · openalex publication_date 1996/05/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the embedding of extreme (multi-) dilaton black hole solutions for the values of the parameter a=√(3),1,1/√(3),0 in N=4 and N=8 four-dimensional supergravity. For each black hole solution we find different embeddings in N=4 supergravity which have different numbers of unbroken supersymmetries. When embedded in N=8 supergravity, all different embeddings of the same solution have the same number of unbroken supersymmetries. Thus, there is a relation between the value of the parameter a and the number of unbroken supersymmetries in N=8 supergravity, but not in N=4, and the different embeddings must be related by dualities of the N=8 theory which are not dualities of the N=4 theory. The only exception in this scheme is a \it dyonic embedding of the a=0 black-hole solution which seems to break all supersymmetries both in the N=4 and in the N=8 theories.