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Increasing the accuracy of binary neutron star simulations with an improved vacuum treatment
- Numerical-relativity simulations are essential for studying the last stages of the binary neutron star coalescence. Unfortunately, for stable simulations there is the need to add an artificial low-density atmosphere. Here we discuss a new framework in which we can effectively set the density surrounding the neutron stars to zero to ensure a more accurate simulation. We test our method with a number of single star test cases and for an equal-mass binary neutron star simulation. While the bulk motion of the system is not influenced, and hence there is no improvement with respect to the emitted gravitational-wave signal, we find that the new approach is superior with respect to mass conservation and it allows a much better tracking of outward moving material. This will allow a more accurate simulation of the ejected material and supports the interpretation of present and future multimessenger observations with more accurate numerical-relativity simulations.
Author details: | Amit PoudelORCiD, Wolfgang TichyORCiD, Bernd BrügmannORCiD, Tim DietrichORCiDGND |
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DOI: | https://doi.org/10.1103/PhysRevD.102.104014 |
ISSN: | 2470-0010 |
ISSN: | 2470-0029 |
Title of parent work (English): | Physical review : D, Particles, fields, gravitation, and cosmology |
Publisher: | American Physical Society |
Place of publishing: | College Park |
Publication type: | Article |
Language: | English |
Date of first publication: | 2020/11/06 |
Publication year: | 2020 |
Release date: | 2023/10/02 |
Volume: | 102 |
Issue: | 10 |
Article number: | 104014 |
Number of pages: | 16 |
Funding institution: | National Science FoundationNational Science Foundation (NSF); [PHY-1305387, PHY-1707227]; DFGGerman Research Foundation (DFG)European; Commission [BR-2176/5-1]; LRZ (Munich, Germany) [pr46pu, pn56zo]; Jureca; (Julich, Germany) [HPO21] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik | |
Peer review: | Referiert |