npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Review Paper

New Phys.: Sae Mulli 2018; 68: 707-717

Published online July 31, 2018

Copyright © New Physics: Sae Mulli.

Gravitational Waves and Tidal Deformability of Neutron Stars

중력파와 중성자별 조력 변형성

Young-Min KIM1, Kyujin KWAK1, Yeunhwan LIM2, Chang Ho HYUN3, Chang-Hwan LEE*4

1 Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
2 Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA
3 Department of Physics Education, Daegu University, Gyeongsan 38453, Korea
4 Department of Physics, Pusan National University, Busan 46241, Korea


Received: May 4, 2018; Revised: May 15, 2018; Accepted: May 15, 2018

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The gravitational waves (GW170817) produced during a binary neutron star inspiral, followed by a gamma-ray burst (GRB 170817A) and afterglows from X-ray to radio wavelength, were observed. By combining the distance obtained from gravitational waves with the red shift obtained from electromagnetic waves, even the Hubble constant was estimated. This indicates the start of new era of multimessenger astronomy. In addition to the masses of inspiralling neutron stars, the tidal deformability, which depends on the inner structures of neutron stars, has been estimated from gravitational waves. This confirms that even strong interactions can be tested by using gravitational waves. In this article, we review the effect of the tidal deformability of neutron stars on the gravitational waves produced during the inspiral process and discuss the implications of the detected tidal deformability for the neutron star's equations of state.

Keywords: Gravitational waves, Neutron star, Equation of state, Tidal deformability

중성자별 병합과정에서 발생한 중력파 GW170817과 감마선폭발 GRB 170817A 및 엑스선에서 전파에 이르는 다양한 파장 영역의 후광 관측이 이루어졌다. 중력파로부터 추정된 GW170817의 거리와 후광 관측의 적색편이를 이용한 허블상수 측정의 성공은 다중신호천문학의 시작을 알리는 계기가 되고 있다. 또한 중력파 분석을 통하여 충돌하는 두 중성자별의 질량 뿐 아니라 중성자별 내부 구조에 의존하는 조력 변형성 측정에 성공함으로서 중력파를 이용하여 강상호작용의 효과를 확인하는 단계에 이르렀다. 이 논문에서는 중성자별의 조력 변형성이 두 중성자별의 병합과정에서 발생하는 중력파에 미치는 영향을 살펴보고, 이번 중력파 관측에서 얻어진 조력 변형성 값이 중성자별의 상태방정식 연구에 미치는 영향을 논의한다.

Keywords: 중력파, 중성자별, 상태방정식, 조력 변형성

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