Ray trajectories for a spinning cosmic string and a manifestation of self-cloaking |
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Authors: | Tom H Anderson Akhlesh Lakhtakia |
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Institution: | a School of Mathematics and Maxwell Institute for Mathematical Sciences, University of Edinburgh, Edinburgh EH9 3JZ, UK b NanoMM - Nanoengineered Metamaterials Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812, USA |
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Abstract: | A study of ray trajectories was undertaken for the Tamm medium which represents the spacetime of a zero-tension cosmic spinning string, under the geometric-optics approximation. Our numerical studies revealed that: (i) rays never cross the string's boundary; (ii) the Tamm medium supports evanescent waves in regions of phase space that correspond to those regions of the string's spacetime which could support closed timelike curves; and (iii) a spinning string can be slightly visible while a non-spinning string is almost perfectly invisible. |
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Keywords: | Cosmic spinning string Tamm medium Invisibility Metamaterial Ray tracing |
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