General relativistic moving-mesh hydrodynamics simulations with AREPO and applications to neutron star mergers
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866929204278329344 |
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| author | Lioutas, Georgios Bauswein, Andreas Soultanis, Theodoros Pakmor, Rüdiger Springel, Volker Röpke, Friedrich K. |
| author_facet | Lioutas, Georgios Bauswein, Andreas Soultanis, Theodoros Pakmor, Rüdiger Springel, Volker Röpke, Friedrich K. |
| contents | 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 spacetime. 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 spacetime evolution, provides a fundamentally new tool to simulate general relativistic problems in astrophysics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2208_04267 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | General relativistic moving-mesh hydrodynamics simulations with AREPO and applications to neutron star mergers Lioutas, Georgios Bauswein, Andreas Soultanis, Theodoros Pakmor, Rüdiger Springel, Volker Röpke, Friedrich K. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology 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 spacetime. 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 spacetime evolution, provides a fundamentally new tool to simulate general relativistic problems in astrophysics. |
| title | General relativistic moving-mesh hydrodynamics simulations with AREPO and applications to neutron star mergers |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2208.04267 |