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  Coalescence of binary neutron stars in a scalar-tensor theory of gravity

Shibata, M., Taniguchi, K., Okawa, H., & Buonanno, A. (2014). Coalescence of binary neutron stars in a scalar-tensor theory of gravity. Physical Review D, 89: 084005. doi:10.1103/PhysRevD.89.084005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F6BB-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-8B35-8
Genre: Journal Article

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 Creators:
Shibata, Masaru, Author
Taniguchi, Keisuke, Author
Okawa, Hirotada, Author
Buonanno, A.1, 2, Author              
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              
2Maryland Center for Fundamental Physics and Joint Space-Science Institute, Department of Physics, University of Maryland, ou_persistent22              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: We carry out numerical-relativity simulations of coalescing binary neutron stars in a scalar-tensor theory that admits spontaneous scalarization. We model neutron stars with realistic equations of state. We choose the free parameters of the theory taking into account the constraints imposed by the latest observations of neutron-star-- white-dwarf binaries with pulsar timing. We show that even within those severe constraints, scalarization can still affect the evolution of the binary neutron stars not only during the late inspiral, but also during the merger stage. We also confirm that even when both neutron stars have quite small scalar charge at large separations, they can be strongly scalarized dynamically during the final stages of the inspiral. In particular, we identify the binary parameters for which scalarization occurs either during the late inspiral or only after the onset of the merger when a remnant, supramassive or hypermassive neutron star is formed. We also discuss how those results can impact the extraction of physical information on gravitational waves once they are detected.

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 Dates: 2013-10-022013-10-042014
 Publication Status: Published in print
 Pages: 17 pages, 12 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1310.0627
DOI: 10.1103/PhysRevD.89.084005
 Degree: -

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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: 89 Sequence Number: 084005 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258