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arXiv 2103.06100gr-qcastro-ph.HEastro-ph.SRhep-th
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自旋对中子星基模动力学潮汐的影响:现象学和数值模拟的比较

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

Jan Steinhoff, Tanja Hinderer, Tim Dietrich, Francois Foucart

摘要:

来自中子星双星螺旋的引力波包含了在未探索的极端状态下强相互作用物质的信息。提取这一点需要强大的理论模型的签名的物质在引力波信号由于自旋和潮汐效应。事实上,自旋对中子星准简正模的潮汐激发有重要影响,这在目前最先进的波形模型中是不包括的。我们开发了一个简单的近似描述,占科里奥利效应的潮汐激发的中子星的四极和八极基本准正常模式的自旋,并将其纳入SEOBNRv 4 T波形模型。我们表明,科里奥利效应只引入了一个新的相互作用项在一个有效的作用,在同向旋转框架的明星,并固定系数考虑自旋引起的共振频率,已计算出的模式频率旋转中子星在文献中的移动。我们调查的影响,由于引力红移和帧拖曳效应的相对论修正,并确定在未来需要更详细的理论发展的重要方向。我们的新模型与双中子星和中子星-黑洞双星的数值相对论模拟的比较表明,与数据分析中使用的现有模型相比,在一致性方面有所改进

英文摘要:

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 quasi-normal 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 quasi-normal 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 co-rotating 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 new 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

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