Two non-isometric smooth globally hyperbolic Lorentzian metrics on an infinite cylinder with timelike boundary share the same hyperbolic Dirichlet-to-Neumann map.
Globally hyperbolic spacetimes can be defined as ‘causal’ instead of ‘strongly causal’
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Counterexamples to the Lorentzian Calder\'on problem
Two non-isometric smooth globally hyperbolic Lorentzian metrics on an infinite cylinder with timelike boundary share the same hyperbolic Dirichlet-to-Neumann map.