![]() For the spinning cosmic string, it was observed that: (i) rays do not cross the string's boundary (ii) evanescent waves are supported in regions of phase space that correspond to those regions of the string's spacetime wherein closed timelike curves may arise and (iii) a non-spinning string is nearly invisible whereas a spinning string may be rather more visible. ![]() A study of ray trajectories for both Tamm mediums was undertaken, within the geometric optics regime. ![]() For both examples, a Tamm medium formulation was developed which is asymptotically identical to vacuum and is therefore amenable to physical realization. We considered two particular curved spacetimes associated with: (a) spinning cosmic strings, and (b) the Alcubierre drive. As the science and technology of nanostructured metamaterials continues its rapid development, the practical realization of Tamm mediums is edging ever closer. These opportunities arise from the formal analogy that exists between light propagation in vacuous curved spacetime and in a certain nonhomogeneous bianisotropic medium, called a Tamm medium. Metamaterials offer opportunities to explore curved-spacetime scenarios which would otherwise be impractical or impossible to study.
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