Formulations of the 3+1 evolution equations in curvilinear coordinates |
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Authors: | Miguel Alcubierre Martha D Mendez |
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Institution: | 1.Instituto de Ciencias Nucleares,Universidad Nacional Autónoma de México,Mexico D.F.,Mexico |
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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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