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

Masaru Shibata, Keisuke Taniguchi, Hirotada Okawa, Alessandra Buonanno

研究成果: Article査読

80 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号084005
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
89
8
DOI
出版ステータスPublished - 2014 4 2
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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