Summary
An extension of the Jost and Karcher coordinates to the relativistic space-time is studied. The domain and Hessian of these extended coordinates are bounded by functions vanishing if the space-time is flat. The quasi-linearity property is analysed in the class of space-times obtained by Tzanakis which generalize the Robertson-Walker model. The transformation of normal Fermi coordinates into quasi-linear coordinates is obtained. Finally, the approximate position vector fields defined using Jost-Karcher coordinates and normal Fermi coordinates are compared.
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Miguel, A.S., Vicente, F. Quasi-linear coordinates in general relativity. Nuov Cim B 111, 39–48 (1996). https://doi.org/10.1007/BF02726199
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DOI: https://doi.org/10.1007/BF02726199