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  Constraint-damping of the CCZ4 formulation in simulations of binary neutron stars

Alic, D., Kastaun, W., & Rezzolla, L. (2013). Constraint-damping of the CCZ4 formulation in simulations of binary neutron stars. Physical Review D, 88: 064049. doi:10.1103/PhysRevD.88.064049.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-3CE8-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-6A09-3
Genre: Journal Article

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 Creators:
Alic, Daniela1, Author              
Kastaun, Wolfgang, Author
Rezzolla, Luciano1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: Following previous work in vacuum spacetimes, we investigate the constraint-damping properties in the presence of matter of the recently developed conformal, traceless, and covariant CCZ4 formulation of the Einstein equations. First, we evolve an isolated neutron star with an ideal gas equation of state and subject to a constraint-violating perturbation. We compare the evolution of the constraints using the CCZ4 and BSSNOK systems. Second, we study the collapse of an unstable spherical star to a black hole. Finally, we evolve binary neutron star systems over several orbits until the merger, the formation of a black hole, and up to the ringdown. We show that the CCZ4 formulation is stable in the presence of matter and that the constraint violations are one or more orders of magnitude smaller than for the BSSNOK formulation. Furthermore, by comparing the CCZ4 and the BSSNOK formulations also for neutron star binaries with large initial constraint violations, we investigate their influence on the errors on physical quantities. We also give a new, simple and robust prescription for the damping parameter that removes the instabilities found when using the fully covariant version of CCZ4 in the evolution of black holes. Overall, we find that at essentially the same computational costs the CCZ4 formulation provides solutions that are stable and with a considerably smaller violation of the Hamiltonian constraint than the BSSNOK formulation. We also find that the performance of the CCZ4 formulation is very similar to another conformal and traceless, but non-covariant formulation of the Z4 system, i.e. the Z4c formulation.

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 Dates: 2013-07-2820132013
 Publication Status: Published in print
 Pages: 15 pages, 11 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1307.7391
DOI: 10.1103/PhysRevD.88.064049
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : Published for the American Physical Society by the American Institute of Physics
Pages: - Volume / Issue: 88 Sequence Number: 064049 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258