114 citations · 342 across the 12 of their papers we have counts for
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Anti-de Sitter Quotients: When Are They Black Holes?
Stefan Aminneborg, Ingemar Bengtsson
We point out that the BTZ black holes, and their relatives, can be defined in a cleaner way than they originally were. The covering space can be taken to be anti-de Sitter space, p…
Black Holes and Wormholes in 2+1 Dimensions
Dieter Brill
Vacuum Einstein theory in three spacetime dimensions is locally trivial, but admits many solutions that are globally different, particularly if there is a negative cosmological con…
Form Connections
Ingemar Bengtsson
Riemannian geometry in four dimensions naturally leads to an SL(3) connection that annihilates a basis for self-dual two-forms. Einstein's equations may be written in terms of an S…
Clifford Algebra of Two-Forms, Conformal Structures and Field Equations
Ingemar Bengtsson
I review the equivalence between duality operators on two-forms and conformal structures in four dimensions, from a Clifford algebra point of view (due to Urbantke and Harnett). I…