Formulations of the 3+1 evolution equations in curvilinear coordinates

Details Formulations of the 3+1 evolution equations in curvilinear coordinates Formulations of the 3+1 evolution equations in curvilinear coordinates

2010-10-19

arxiv.org/abs/1010.4013v1

Gen.Rel.Grav.43:2769-2806,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, 12 figures

Scientific paper

10.1007/s10714-011-1202-x

Following Brown, 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 (NOR) 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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