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arXiv 1807.04727gr-qcastro-ph.HEnucl-th
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从GW170817得到的PSR J0737-3039A的转动惯量约束

Constraints on the moment of inertia of PSR J0737-3039A from GW170817

Philippe Landry, Bharat Kumar

摘要:

对PSR J 0737 -3039这颗双脉冲星的持续观测,有望在未来几年内精确确定其主要组成部分的转动惯量。由于转动惯量敏感地依赖于中子星的内部结构,这样的测量将约束超致密物质的状态方程,而超致密物质的状态方程被认为是普适的。通过对GW 170817中子星潮汐形变的引力波测量,已经建立了独立的物态方程约束。在这里,使用众所周知的中子星可观测量之间的普遍关系,我们将报告的90%可信的潮汐变形性的界限转化为一个直接的约束,$I_{\star} = 1.15^{+0.38}_{-0.24} \times 10^{45} \text{ g cm}^2$,PSR J 0737 - 3039 A的转动惯量。如果未来对$I_{\star}$的天体物理测量与这一预测不一致,它可能表明中子-恒星状态方程的普遍性崩溃。

英文摘要:

Continued observation of PSR J0737-3039, the double pulsar, is expected to yield a precise determination of its primary component's moment of inertia in the next few years. Since the moment of inertia depends sensitively on the neutron star's internal structure, such a measurement will constrain the equation of state of ultra-dense matter, which is believed to be universal. Independent equation-of-state constraints have already been established by the gravitational-wave measurement of the neutron-star tidal deformability in GW170817. Here, using well-known universal relations among neutron star observables, we translate the reported 90%-credible bounds on tidal deformability into a direct constraint, $I_{\star} = 1.15^{+0.38}_{-0.24} \times 10^{45} \text{ g cm}^2$, on the moment of inertia of PSR J0737-3039A. Should a future astrophysical measurement of $I_{\star}$ disagree with this prediction, it could indicate a breakdown in the universality of the neutron-star equation of state.

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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