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  Constructing binary neutron star initial data with high spins, high compactnesses, and high mass ratios

Tichy, W., Rashti, A., Dietrich, T., Dudi, R., & Brügmann, B. (2019). Constructing binary neutron star initial data with high spins, high compactnesses, and high mass ratios. Physical Review D, 100: 124046. doi:10.1103/PhysRevD.100.124046.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-E6E1-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7397-F
Genre: Journal Article

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 Creators:
Tichy, Wolfgang, Author
Rashti, Alireza, Author
Dietrich, Tim, Author
Dudi, Reetika1, Author              
Brügmann, Bernd, Author
Affiliations:
1Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: The construction of accurate and consistent initial data for various binary parameters is a critical ingredient for numerical relativity simulations of the compact binary coalescence. In this article, we present an upgrade of the pseudospectral SGRID code, which enables us to access even larger regions of the binary neutron star parameter space. As a proof of principle, we present a selected set of first simulations based on initial configurations computed with the new code version. In particular, we simulate two millisecond pulsars close to their breakup spin, highly compact neutron stars with masses at about $98\%$ of the maximum supported mass of the employed equation of state, and an unequal mass systems with mass ratios even outside the range predicted by population synthesis models ($q = 2.03$). The discussed code extension will help us to simulate previously unexplored binary configurations. This is a necessary step to construct and test new gravitational wave approximants and to interpret upcoming binary neutron star merger observations. When we construct initial data, one has to specify various parameters, such as a rotation parameter for each star. Some of these parameters do not have direct physical meaning, which makes comparisons with other methods or models difficult. To facilitate this, we introduce simple estimates for the initial spin, momentum, mass, and center of mass of each individual star.

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 Dates: 2019-10-212019
 Publication Status: Published in print
 Pages: 16 pages, 11 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1910.09690
URI: http://arxiv.org/abs/1910.09690
DOI: 10.1103/PhysRevD.100.124046
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 100 Sequence Number: 124046 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258