Measurement of Tidal Deformability in the Gravitational Wave Parameter Estimation for Nonspinning Binary Neutron Star Mergers
J. Korean Phys. Soc. 2019; 74: 842~846
Published online May 15, 2019 © 2019 The Korean Physical Society.

1 Department of Physics, Pusan National University, Busan 46241, Korea 
2 Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
Correspondence to: Yong-Beom Choi, Hee-Suk Cho, Chang-Hwan Lee, Young-Min Kim
One of the main targets for the ground-based gravitational wave (GW) detectors such as Advanced LIGO and Virgo is coalescences of neutron star (NS) binaries. The tidal deformability of a NS, which depends on the internal structure of the NS, has been recently obtained from GW observations. In this work, we investigate the measurement errors for mass and tidal deformability in GW parameter estimation by using the Fisher matrix method. We use a post-Newtonian (PN) waveform model in which the tidal deformability contribution appears from 5 PN order. The figure shows that if the tidal deformability corrections are considered up to the 6 PN order, the measurement error for the dimensionless tidal deformability can be reduced to about 75% compared to that obtained by considering only the 5 PN order correction.
PACS numbers: 04.25.Nx, 04.30.Tv, 26.60.Kp
Keywords: Gravitational waves, Post-Newtonian approximation, Neutron star, Equation of state, Fisher matrix

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