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arXiv 2202.05161astro-ph.HEgr-qc
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超流中子星中的动力学潮汐

Dynamical tides in superfluid neutron stars

Andrea Passamonti, Nils Andersson, Pantelis Pnigouras

摘要:

我们研究了超流中子星在双星系统中的潮汐响应,重点是超流中子存在于整个恒星的核心和内部地壳的牛顿模型。在双流体的形式主义,我们认为,从恒星内部的不同区域的存在所产生的主要方面,特别关注的各种接口。在建立了相关理论的基础上,确定了双星内旋过程中最相关振荡模的潮汐激发。我们的结果表明,超流物理的静态潮汐变形的影响可以忽略不计。对于正常物质的恒星来说,对洛夫数的绝大多数贡献是由普通基本模(f模)给出的。强夹带,在这里描述的现象学表达式,模仿大的有效中子质量预计在地壳底部,被证明有显着的超流模式的影响,但我们的动态潮汐的结果是类似的静态限制:基本模式是最显着激发的潮汐相互作用,与普通的f-模式占主导地位的超流之一。我们还讨论了应变建立在恒星的地壳在二进制inspiral,表明超流的f-模式可能(取决于夹带)达到地壳破裂的极限,虽然它这样做后,普通的f-模式。总的来说,我们的研究结果表明,超流的存在可能很难建立从双中子星引力波信号。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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