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Millisecond radio pulsars with known masses: Parameter values and equation of state models

机译:质量已知的毫秒无线电脉冲星:参数值和状态模型方程

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摘要

The recent fast growth of a population of millisecond pulsars with precisely measured mass provides an excellent opportunity to characterize these compact stars at an unprecedented level. This is because the stellar parameter values can be accurately computed for known mass and spin rate and an assumed equation of state (EoS) model. For each of the 16 such pulsars and for a set of EoS models from nucleonic, hyperonic, strange quark matter and hybrid classes, we numerically compute fast spinning stable stellar parameter values considering the full effect of general relativity. This first detailed catalogue of the computed parameter values of observed millisecond pulsars provides a testbed to probe the physics of compact stars, including their formation, evolution and EoS. We estimate uncertainties on these computed values from the uncertainty of the measured mass, which could be useful to quantitatively constrain EoS models. We note that the largest value of the central density ρc in our catalogue is ∼5.8 times the nuclear saturation density ρsat, which is much less than the expected maximum value 13ρsat. We argue that the ρc-values of at most a small fraction of compact stars could be much larger than 5.8ρsat. Besides, we find that the constraints on EoS models from accurate radius measurements could be significantly biased for some of our pulsars, if stellar spinning configurations are not used to compute the theoretical radius values.
机译:精确测量质量的毫秒脉冲星群的快速增长为以前所未有的水平表征这些紧凑型恒星提供了极好的机会。这是因为对于已知的质量和自旋速率以及假定的状态方程(EoS)模型,可以准确地计算恒星参数值。对于16个这样的脉冲星中的每一个,以及对于来自核子,高子,奇数夸克物质和混合类的EoS模型集,我们在考虑广义相对论的全部影响的情况下,通过数值计算快速旋转稳定的恒星参数值。这第一份有关观测到的毫秒脉冲星的计算参数值的详细目录,提供了一个试验台,以探测紧凑恒星的物理学,包括其形成,演化和EoS。我们从测量质量的不确定性估计这些计算值的不确定性,这可能对定量约束EoS模型有用。我们注意到,在我们的目录中,中心密度ρc的最大值约为核饱和密度ρsat的5.8倍,远小于预期的最大值13ρsat。我们认为最多只有一小部分紧凑恒星的ρc值可能比5.8ρsat大得多。此外,我们发现,如果不使用恒星旋转配置来计算理论半径值,则精确的半径测量结果对EoS模型的约束可能会严重偏离我们的某些脉冲星。

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