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  Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code

Haas, R., Ott, C. D., Szilagyi, B., Kaplan, J. D., Lippuner, J., Scheel, M. A., et al. (2016). Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code. Physical Review D, 93: 124062. doi:10.1103/PhysRevD.93.124062.

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 Urheber:
Haas, Roland1, Autor           
Ott, Christian D.2, Autor           
Szilagyi, Bela3, Autor           
Kaplan, Jeffrey D., Autor
Lippuner, Jonas, Autor
Scheel, Mark A., Autor
Barkett, Kevin, Autor
Muhlberger, Curran D., Autor
Dietrich, Tim, Autor
Duez, Matthew D., Autor
Foucart, Francois, Autor
Pfeiffer, Harald P., Autor
Kidder, Lawrence E., Autor
Teukolsky, Saul A., Autor
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              
2Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              
3Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Schlagwörter: General Relativity and Quantum Cosmology, gr-qc
 Zusammenfassung: We present results on the inspiral, merger, and post-merger evolution of a neutron star - neutron star (NSNS) system. Our results are obtained using the hybrid pseudospectral-finite volume Spectral Einstein Code (SpEC). To test our numerical methods, we evolve an equal-mass system for $\approx 22$ orbits before merger. This waveform is the longest waveform obtained from fully general-relativistic simulations for NSNSs to date. Such long (and accurate) numerical waveforms are required to further improve semi-analytical models used in gravitational wave data analysis, for example the effective one body models. We discuss in detail the improvements to SpEC's ability to simulate NSNS mergers, in particular mesh refined grids to better resolve the merger and post-merger phases. We provide a set of consistency checks and compare our results to NSNS merger simulations with the independent BAM code. We find agreement between them, which increases confidence in results obtained with either code. This work paves the way for future studies using long waveforms and more complex microphysical descriptions of neutron star matter in SpEC.

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 Datum: 2016-04-0420162016
 Publikationsstatus: Erschienen
 Seiten: 23 pages, 15 figures
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Titel: Physical Review D
  Andere : Phys. Rev. D.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Lancaster, Pa. : American Physical Society
Seiten: - Band / Heft: 93 Artikelnummer: 124062 Start- / Endseite: - Identifikator: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258