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A Note on trapped Surfaces in the Vaidya Solution
Ingemar Bengtsson, José M. M. Senovilla
The Vaidya solution describes the gravitational collapse of a finite shell of incoherent radiation falling into flat spacetime and giving rise to a Schwarzschild black hole. There…
Universality of state-independent violation of correlation inequalities for noncontextual theories
Piotr Badziag, Ingemar Bengtsson, Adan Cabello +1
We show that the state-independent violation of inequalities for noncontextual hidden variable theories introduced in [Phys. Rev. Lett. 101, 210401 (2008)] is universal, i.e., occu…
The Frame Potential, on Average
Ingemar Bengtsson, Helena Granstrom
A SIC consists of N^2 equiangular unit vectors in an N dimensional Hilbert space. The frame potential is a function of N^2 unit vectors. It has a unique global minimum if the vecto…
Anti-de Sitter Quotients, Bubbles of Nothing, and Black Holes
Jan E. Aman, Stefan Aminneborg, Ingemar Bengtsson +1
In 3+1 dimensions there are anti-de quotients which are black holes with toroidal event horizons. By analytic continuation of the Schwarzschild-anti-de Sitter solution (and appropr…
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…