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arXiv 2409.14482gr-qcnucl-th
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具有各向异性壳层和连续引力波的旋转中子星的有限元模拟

Finite-Element Simulations of Rotating Neutron Stars with Anisotropic Crusts and Continuous Gravitational Waves

J. A. Morales, C. J. Horowitz

AI总结:

本文通过三维有限元模拟研究旋转中子星固态壳层各向异性引发的“山”形变,发现其产生的引力波可被现有探测器探测,且椭率上限与邻近快速自转脉冲星观测值相符。

摘要:

旋转中子星弹性壳层中的“山”,即非轴对称形变,是连续引力波的高效辐射源。近期,在地球的固态最内核中观察到了微小各向异性。我们实施三维有限元模拟,研究由旋转中子星固态壳层中适度各向异性引发的“山”。我们发现,各向异性“山”可能被现有地面引力波探测器探测到,并可能解释若干观测现象,这证实了先前基于较不真实中子星模型的研究结果。具体而言,我们发现轻微各向异性的中子星壳层在适度改变自转速率时,能支撑约几乘10^-9的椭率,这等同于部分邻近且快速自转脉冲星椭率的上限。

英文摘要:

``Mountains'', or non-axisymmetrical deformations in the elastic crust of rotating neutron stars are efficient radiators of continuous gravitational waves. Recently, small anisotropies were observed in the solid innermost inner core of the Earth. We implement three-dimensional finite-element simulations to study mountains sourced by modest anisotropies in the solid crust of rotating neutron stars. We find that anisotropic mountains may be detectable by current ground-based gravitational-wave detectors and might explain several observed phenomena, confirming the results of a previous work on less realistic neutron star models. In particular, we find that a slightly anisotropic neutron star crust that changes its rotation rate modestly can support an ellipticity of a few $\times$ 10$^{-9}$, which is equivalent to the upper bounds on the ellipticity of some nearby and rapidlly spinning pulsars.

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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