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  High-accuracy simulations of highly spinning binary neutron star systems

Dudi, R., Dietrich, T., Rashti, A., Bruegmann, B., Steinhoff, J., & Tichy, W. (2022). High-accuracy simulations of highly spinning binary neutron star systems. Physical Review D, 105(6): 064050. doi:10.1103/PhysRevD.105.064050.

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 Creators:
Dudi, Reetika1, Author           
Dietrich, Tim1, 2, Author           
Rashti , Alireza, Author
Bruegmann, Bernd, Author
Steinhoff, Jan1, Author           
Tichy , Wolfgang, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              
2Multi-messenger Astrophysics of Compact Binaries, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_3329942              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
 Abstract: With an increasing number of expected gravitational-wave detections of binary neutron star mergers, it is essential that gravitational-wave models employed for the analysis of observational data are able to describe generic compact binary systems. This includes systems in which the individual neutron stars are millisecond pulsars for which spin effects become essential. In this work, we perform numerical-relativity simulations of binary neutron stars with aligned and anti-aligned spins within a range of dimensionless spins of $\chi \sim [-0.28,0.58]$. The simulations are performed with multiple resolutions, show a clear convergence order and, consequently, can be used to test existing waveform approximants. We find that for very high spins gravitational-wave models that have been employed for the interpretation of GW170817 and GW190425 are not capable of describing our numerical-relativity dataset. We verify through a full parameter estimation study in which clear biases in the estimate of the tidal deformability and effective spin are present. We hope that in preparation of the next gravitational-wave observing run of the Advanced LIGO and Advanced Virgo detectors our new set of numerical-relativity data can be used to support future developments of new gravitational-wave models.

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 Dates: 2021-08-232022
 Publication Status: Published in print
 Pages: 13 pages, 8 figures
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 Identifiers: arXiv: 2108.10429
DOI: 10.1103/PhysRevD.105.064050
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Title: Physical Review D
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Pages: - Volume / Issue: 105 (6) Sequence Number: 064050 Start / End Page: - Identifier: -