Spin effects on neutron star fundamental-mode dynamical tides: Phenomenology and comparison to numerical simulations

被引:45
作者
Steinhoff, Jan [1 ]
Hinderer, Tanja [2 ]
Dietrich, Tim [1 ,3 ]
Foucart, Francois [4 ]
机构
[1] Max Planck Inst Gravitat Phys, Albert Einstein Inst, Am Muhlenberg 1, Potsdam, Germany
[2] Univ Utrecht, Inst Theoret Phys, Princetonpl 5, NL-3584 CC Utrecht, Netherlands
[3] Univ Potsdam, Inst Phys & Astron, Haus 28,Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
[4] Univ New Hampshire, Dept Phys, 9 Lib Way, Durham, NH 03824 USA
来源
PHYSICAL REVIEW RESEARCH | 2021年 / 3卷 / 03期
基金
美国国家科学基金会;
关键词
EQUATION-OF-STATE; ROTATING RELATIVISTIC STARS; GRAVITATIONAL-WAVES; BLACK-HOLE; COMPACT BINARIES; TIDAL EXCITATION; OSCILLATIONS; CONSTRAINTS; EVOLUTION;
D O I
10.1103/PhysRevResearch.3.033129
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Gravitational waves from neutron star binary inspirals contain information on strongly interacting matter in unexplored, extreme regimes. Extracting this requires robust theoretical models of the signatures of matter in the gravitational-wave signals due to spin and tidal effects. In fact, spins can have a significant impact on the tidal excitation of the quasinormal modes of a neutron star, which is not included in current state-of-the-art waveform models. We develop a simple approximate description that accounts for the Coriolis effect of spin on the tidal excitation of the neutron star's quadrupolar and octupolar fundamental quasinormal modes and incorporate it in the SEOBNRv4T waveform model. We show that the Coriolis effect introduces only one new interaction term in an effective action in the corotating frame of the star, and fix the coefficient by considering the spin-induced shift in the resonance frequencies that has been computed numerically for the mode frequencies of rotating neutron stars in the literature. We investigate the impact of relativistic corrections due to the gravitational redshift and frame-dragging effects, and identify important directions where more detailed theoretical developments are needed in the future. Comparisons of our model to numerical-relativity simulations of double neutron star and neutron star black-hole binaries show improved consistency in the agreement compared to current models used in data analysis.
引用
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页数:22
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