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arXiv 2109.07566astro-ph.HEgr-qc
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动力潮对中子星状态方程重建的影响

Impact of Dynamical Tides on the Reconstruction of the Neutron Star Equation of State

Geraint Pratten, Patricia Schmidt, Natalie Williams

摘要:

螺旋运动的中子星产生的引力波为我们提供了一个独特的机会来推断超核密度下冷强子物质的状态方程。在螺旋过程中,由于恒星对伴星潮汐场的响应,主导物质效应出现,在发出的GW信号中留下特征印记。这种独特的特征使我们能够约束冷中子星状态方程。然而,在GW频率高于$\gtrsim 800$ Hz时,称为动力潮汐的次优势潮汐效应变得重要。在这封信中,我们表明,忽略动力学潮汐效应与基本($f$ -)模式导致大的系统偏差,在测量的潮汐变形的恒星,因此在推断的中子星状态方程。重要的是,我们发现$f$模式的动力学潮汐已经与高级LIGO和Virgo的第五次观测运行($\sim 2025$)相关-忽略动力学潮汐可能会导致$\mathcal{O}(1{\rm km})$的中子半径误差,对状态方程的测量具有戏剧性的影响。我们的研究结果表明,准确的次主导潮汐效应超过绝热极限的建模将是至关重要的,在即将到来的GW观测的中子星状态方程的精确测量。

英文摘要:

Gravitational waves (GWs) from inspiralling neutron stars afford us a unique opportunity to infer the as-of-yet unknown equation of state of cold hadronic matter at supranuclear densities. During the inspiral, the dominant matter effects are arise due to the star's response to their companion's tidal field, leaving a characteristic imprint in the emitted GW signal. This unique signature allows us to constrain the cold neutron star equation of state. At GW frequencies above $\gtrsim 800$Hz, however, subdominant tidal effects known as dynamical tides become important. In this letter, we demonstrate that neglecting dynamical tidal effects associated with the fundamental ($f$-) mode leads to large systematic biases in the measured tidal deformability of the stars and hence in the inferred neutron star equation of state. Importantly, we find that $f$-mode dynamical tides will already be relevant for Advanced LIGO's and Virgo's fifth observing run ($\sim 2025$) -- neglecting dynamical tides can lead to errors on the neutron radius of $\mathcal{O}(1{\rm km})$, with dramatic implications for the measurement of the equation of state. Our results demonstrate that the accurate modelling of subdominant tidal effects beyond the adiabatic limit will be crucial to perform accurate measurements of the neutron star equation of state in upcoming GW observations.

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