General relativistic moving-mesh hydrodynamic simulations with arepo and applications to neutron star mergers
We implement general relativistic hydrodynamics in the moving-mesh code arepo. We also couple a solver for the Einstein field equations employing the conformal flatness approximation. The implementation is validated by evolving isolated static neutron stars using a fixed metric or a dynamical space-...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
February 2024
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2024, Volume: 528, Issue: 2, Pages: 1906-1929 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stae057 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnras/stae057
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| Author Notes: | Georgios Lioutas, Andreas Bauswein, Theodoros Soultanis, Rüdiger Pakmor, Volker Springel, Friedrich K Röpke |
| Summary: | We implement general relativistic hydrodynamics in the moving-mesh code arepo. We also couple a solver for the Einstein field equations employing the conformal flatness approximation. The implementation is validated by evolving isolated static neutron stars using a fixed metric or a dynamical space-time. In both tests, the frequencies of the radial oscillation mode match those of independent calculations. We run the first moving-mesh simulation of a neutron star merger. The simulation includes a scheme to adaptively refine or derefine cells and thereby adjusting the local resolution dynamically. The general dynamics are in agreement with independent smoothed particle hydrodynamics and static-mesh simulations of neutron star mergers. Coarsely comparing, we find that dynamical features like the post-merger double-core structure or the quasi-radial oscillation mode persist on longer time scales, possibly reflecting a low numerical diffusivity of our method. Similarly, the post-merger gravitational wave emission shows the same features as observed in simulations with other codes. In particular, the main frequency of the post-merger phase is found to be in good agreement with independent results for the same binary system, while, in comparison, the amplitude of the post-merger gravitational wave signal falls off slower, i.e. the post-merger oscillations are less damped. The successful implementation of general relativistic hydrodynamics in the moving-mesh arepo code, including a dynamical space-time evolution, provides a fundamentally new tool to simulate general relativistic problems in astrophysics. |
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| Item Description: | Online veröffentlicht: 10. Januar 2024 Gesehen am 17.09.2024 |
| Physical Description: | Online Resource |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stae057 |