Quasiuniversal Properties of Neutron Star Mergers

被引：98

作者：

Bernuzzi, Sebastiano ^{[1
]}

Nagar, Alessandro ^{[2
]}

Balmelli, Simone ^{[3
]}

Dietrich, Tim ^{[1
]}

Ujevic, Maximiliano ^{[4
]}

机构：

[1] Univ Jena, Inst Theoret Phys, D-07743 Jena, Germany

[2] Inst Hautes Etud Sci, F-91440 Bures Sur Yvette, France

[3] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[4] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Sao Paulo, Brazil

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 20期

基金：

瑞士国家科学基金会;

关键词：

Analytical predictions - Binary interactions - Binary neutron stars - Coupling constants - Equation of state - Numerical relativity - Orbital angular momentum - Spin dependence;

D O I：

10.1103/PhysRevLett.112.201101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Binary neutron star mergers are studied using nonlinear 3 + 1 numerical relativity simulations and the analytical effective-one-body model. The effective-one-body model predicts quasiuniversal relations between the mass-rescaled gravitational wave frequency and the binding energy at the moment of merger and certain dimensionless binary tidal coupling constants depending on the stars' Love numbers, compactnesses, and the binary mass ratio. These relations are quasiuniversal in the sense that, for a given value of the tidal coupling constant, they depend significantly neither on the equation of state nor on the mass ratio, though they do depend on stars spins. The spin dependence is approximately linear for small spins aligned with the orbital angular momentum. The quasiuniversality is a property of the conservative dynamics; nontrivial relations emerge as the binary interaction becomes tidally dominated. This analytical prediction is qualitatively consistent with new, multiorbit numerical relativity results for the relevant case of equal-mass irrotational binaries. Universal relations are, thus, expected to characterize neutron star mergers dynamics. In the context of gravitational wave astronomy, these universal relations may be used to constrain the neutron star equation of state using waveforms that model the merger accurately.

引用

页数：5

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