Constraint violation in free evolution schemes: comparing BSSNOK with a conformal decomposition of Z4

Details Constraint violation in free evolution schemes: comparing BSSNOK with a conformal decomposition of Z4 Constraint violation in free evolution schemes: comparing BSSNOK with a conformal decomposition of Z4

2009-12-15

arxiv.org/abs/0912.2920v2

Phys.Rev.D81:084003,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Published in PRD

Scientific paper

10.1103/PhysRevD.81.084003

We compare numerical evolutions performed with the BSSNOK formulation and a conformal decomposition of a Z4-like formulation of General Relativity. The important difference between the two formulations is that the Z4 formulation has a propagating Hamiltonian constraint, whereas BSSNOK has a zero-speed characteristic variable in the constraint subsystem. In spherical symmetry we evolve both puncture and neutron star initial data. We demonstrate that the propagating nature of the Z4 constraints leads to results that compare favorably with BSSNOK evolutions, especially when matter is present in the spacetime. From the point of view of implementation the new system is a simple modification of BSSNOK.

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