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gr-qc2026
Mirror Symmetry and Double Signature Change
Tevian Dray, Charles Hellaby
The black mirror spacetime proposed by Tzanavaris, Boyle, and Turok [1] connects the two exterior regions of the extended Schwarzschild black hole directly to each other, with no i…
gr-qc2019
Reflections on the Energy of Black Holes
Tevian Dray, Carlo Rovelli
Inside a black hole, there is no local way to say which side of a sphere is the inside, and which is the outside. One can easily be gulled by this fact into mixing up the sign of t…