Abstract
Following Brown (Phys Rev D79:104029, 2009), in this paper we give an overview of how to modify standard hyperbolic formulations of the 3+1 evolution equations of General Relativity in such a way that all auxiliary quantities are true tensors, thus allowing for these formulations to be used with curvilinear sets of coordinates such as spherical or cylindrical coordinates. After considering the general case for both the Nagy–Ortiz–Reula and the Baumgarte–Shapiro–Shibata–Nakamura (BSSN) formulations, we specialize to the case of spherical symmetry and also discuss the issue of regularity at the origin. Finally, we show some numerical examples of the modified BSSN formulation at work in spherical symmetry.
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Alcubierre, M., Mendez, M.D. Formulations of the 3+1 evolution equations in curvilinear coordinates. Gen Relativ Gravit 43, 2769–2806 (2011). https://doi.org/10.1007/s10714-011-1202-x
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DOI: https://doi.org/10.1007/s10714-011-1202-x