Boyer-Lindquist space-times and beyond: Meta-material analogues
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2018
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| _version_ | 1866907848014823424 |
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| author | Schuster, Sebastian Visser, Matt |
| author_facet | Schuster, Sebastian Visser, Matt |
| contents | Analogue space-times (and in particular metamaterial analogue space-times) have a long varied and complex history. Much of the previous related work has focused on spherically symmetric models; however, axial symmetry is much more relevant for mimicking rotating systems. It is well known that physically reasonable stationary axisymmetric space-times can, under very mild technical conditions, be put into Boyer--Lindquist form. Unfortunately, a metric presented in Boyer--Lindquist form is not well adapted to the "quasi-Cartesian" analysis that we developed in our previous articles on "bespoke analogue space-times". Herein, we shall first focus specifically on various space-time metrics presented in Boyer--Lindquist form, and subsequently determine a suitable set of equivalent metamaterial susceptibility tensors in a laboratory setting. We shall then turn to analyzing generic space-times, not even necessarily stationary, again determining a suitable set of equivalent metamaterial susceptibility tensors. Perhaps surprisingly, we find that the well-known ADM formalism proves to be not particularly useful, and that instead the dual "threaded" (Kaluza--Klein--inspired) formalism provides much more tractable results. While the background laboratory metric is (for mathematical simplicity and physical plausibility) always taken to be Riemann flat, we {will} allow for arbitrary curvilinear coordinate systems on the flat background space-time. Finally, for completeness, we shall reconsider spherically symmetric space-times, but now in general spherical polar coordinates rather than quasi-Cartesian coordinates. In summary, this article provides a set of general-purpose calculational tools that can readily be adapted for mimicking various interesting (curved) space-times by using nontrivial susceptibility tensors in general (background-flat) laboratory settings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1802_09807 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | Boyer-Lindquist space-times and beyond: Meta-material analogues Schuster, Sebastian Visser, Matt General Relativity and Quantum Cosmology Analogue space-times (and in particular metamaterial analogue space-times) have a long varied and complex history. Much of the previous related work has focused on spherically symmetric models; however, axial symmetry is much more relevant for mimicking rotating systems. It is well known that physically reasonable stationary axisymmetric space-times can, under very mild technical conditions, be put into Boyer--Lindquist form. Unfortunately, a metric presented in Boyer--Lindquist form is not well adapted to the "quasi-Cartesian" analysis that we developed in our previous articles on "bespoke analogue space-times". Herein, we shall first focus specifically on various space-time metrics presented in Boyer--Lindquist form, and subsequently determine a suitable set of equivalent metamaterial susceptibility tensors in a laboratory setting. We shall then turn to analyzing generic space-times, not even necessarily stationary, again determining a suitable set of equivalent metamaterial susceptibility tensors. Perhaps surprisingly, we find that the well-known ADM formalism proves to be not particularly useful, and that instead the dual "threaded" (Kaluza--Klein--inspired) formalism provides much more tractable results. While the background laboratory metric is (for mathematical simplicity and physical plausibility) always taken to be Riemann flat, we {will} allow for arbitrary curvilinear coordinate systems on the flat background space-time. Finally, for completeness, we shall reconsider spherically symmetric space-times, but now in general spherical polar coordinates rather than quasi-Cartesian coordinates. In summary, this article provides a set of general-purpose calculational tools that can readily be adapted for mimicking various interesting (curved) space-times by using nontrivial susceptibility tensors in general (background-flat) laboratory settings. |
| title | Boyer-Lindquist space-times and beyond: Meta-material analogues |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/1802.09807 |