arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0905.1959astro-ph.HE
收藏

利用天体物理测量数据重建中子星状态方程

Reconstructing the Neutron-Star Equation of State from Astrophysical Measurements

Feryal Ozel, Dimitrios Psaltis

摘要:

在超高密度、低温和质子与中子之间显著不对称的情况下,物质的性质只能通过对中子星的天体物理观测来研究。我们表明,测量的质量和半径的中子星可以导致严格的约束压力的物质在三个基准密度,从1.85到7.4倍的核饱和密度,在很大程度上是模型无关的方式,并捕捉状态方程的关键特征。我们证明,至少三个中子星的10%的不确定性的观测可以导致在这些基准密度的压力测量精度为0.11 dex或~ 30%。三颗中子星的观测结果具有5%的不确定性,足以在优于3-sigma的置信水平上区分当前提出的状态方程。在电磁波谱中,在热核闪光期间和在国际X射线天文台(IXO)等未来任务的静止期,对弱磁性中子星进行这种精确测量将成为可能。

英文摘要:

The properties of matter at ultra-high densities, low temperatures, and with a significant asymmetry between protons and neutrons can be studied exclusively through astrophysical observations of neutron stars. We show that measurements of the masses and radii of neutron stars can lead to tight constraints on the pressure of matter at three fiducial densities, from 1.85 to 7.4 times the density of nuclear saturation, in a manner that is largely model-independent and that captures the key characteristics of the equation of state. We demonstrate that observations with 10% uncertainties of at least three neutron stars can lead to measurements of the pressure at these fiducial densities with an accuracy of 0.11 dex or ~ 30%. Observations of three neutron stars with 5% uncertainties are sufficient to distinguish at a better than 3-sigma confidence level between currently proposed equations of state. In the electromagnetic spectrum, such accurate measurements will become possible for weakly-magnetic neutron stars during thermonuclear flashes and in quiescence with future missions such as the International X-ray Observatory (IXO).

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。

↑