论文标题

超流体中子星中的动态潮汐

Dynamical tides in superfluid neutron stars

论文作者

Passamonti, Andrea, Andersson, Nils, Pnigouras, Pantelis

论文摘要

我们研究了二元系统中超流体中子星的潮汐反应,重点是牛顿模型,这些模型在整个恒星的核心和内壳中都存在超氟中子。在两流体形式主义中,我们考虑了恒星内部不同区域的存在所产生的主要方面,特别关注各种界面。建立了相关理论后,我们确定了二元灵感期间最相关的振荡模式的潮汐激发。我们的结果表明,超流体物理学对静态潮汐变形具有可忽略的影响。对于普通的恒星,对爱人的贡献(F-Mode)给出了压倒性的贡献。在这里描述了强烈的夹带,以一种现象学表达来描述,该现象学表达模仿了地壳底部的大量有效中子质量,对超级流体模式产生了重大影响,但是我们对动力潮汐的结果类似于静态限制:基本模式仍然是由普通的f mode and supperfluud harme hame of suppure the suplefluud harm the the the the基本模式最大的兴奋。我们还讨论了在二进制Inspral期间恒星外壳中积累的菌株,表明超流体F模式可能(取决于夹带)达到了地壳断裂的极限,尽管它在普通F模式之后会发生。总体而言,我们的结果表明,超流量的存在可能很难从二元中子星引力波信号中建立。

We study the tidal response of a superfluid neutron star in a binary system, focussing on Newtonian models with superfluid neutrons present throughout the star's core and the inner crust. Within the two-fluid formalism, we consider the main aspects that arise from the presence of different regions inside the star, with particular focus on the various interfaces. Having established the relevant theory, we determine the tidal excitation of the most relevant oscillation modes during binary inspiral. Our results suggest that superfluid physics has a negligible impact on the static tidal deformation. The overwhelming contribution to the Love number is given by, as for normal matter stars, the ordinary fundamental mode (f-mode). Strong entrainment, here described by a phenomenological expression which mimics the large effective neutron mass expected at the bottom of the crust, is shown to have significant impact on the superfluid modes, but our results for the dynamical tide are nevertheless similar to the static limit: the fundamental modes are the ones most significantly excited by the tidal interaction, with the ordinary f-mode dominating the superfluid one. We also discuss the strain built up in the star's crust during binary inspiral, showing that the superfluid f-mode may (depending on entrainment) reach the limit where the crust breaks, although it does so after the ordinary f-mode. Overall, our results suggest that the presence of superfluidity may be difficult to establish from binary neutron star gravitational-wave signals.

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