论文标题
各向异性中子星建模：Krori-Barua时空的约束
Anisotropic Neutron Stars Modelling: Constraints in Krori-Barua Spacetime
论文作者
论文摘要
由于固化，超流量，强磁场，超子，脉冲调节等作用，预计密集的核物质将是各向异性的。因此，各向异性中子星核似乎比理想的各向同性恒星更现实。我们对在Krori-Barua（KB）Ansatz中工作的各向异性中子星建模，而无需先添加状态方程。我们表明，一般KB溶液的物理学被封装在紧凑性中。施加物理和稳定性需求可产生最大允许的紧凑型$ 2gm/rc^2 <0.71 $，用于KB-Spactime。我们进一步输入来自众多脉冲星的观测数据，并计算边界密度。我们特别关注来自Ligo/处女座协作的数据，以及最新的独立测量，对Miilisecond Pulsars的质量和半径与Neutron Star Interior Coption Explorer（NECER）的白矮人伴侣的质量和半径。对于这些数据，Kb-spacetime给出了相同的边界密度，这在数据精度内等于核饱和密度。由于该值指定了中子核的边界，因此KB-As-Spacetime自然适用于中子星。对于这种边界条件，我们计算的最大质量为4.1太阳能。
Dense nuclear matter is expected to be anisotropic due to effects such as solidification, superfluidity, strong magnetic fields, hyperons, pion-condesation. Therefore an anisotropic neutron star core seems more realistic than an ideally isotropic one. We model anisotropic neutron stars working in the Krori-Barua (KB) ansatz without preassuming an equation of state. We show that the physics of general KB solutions is encapsulated in the compactness. Imposing physical and stability requirements yields a maximum allowed compactness $2GM/Rc^2 < 0.71$ for a KB-spacetime. We further input observational data from numerous pulsars and calculate the boundary density. We focus especially on data from the LIGO/Virgo collaboration as well as recent independent measurements of mass and radius of miilisecond pulsars with white dwarf companions by the Neutron Star Interior Composition Explorer (NICER). For these data the KB-spacetime gives the same boundary density which surprisingly equals the nuclear saturation density within the data precision. Since this value designates the boundary of a neutron core, the KB-spacetime applies naturally to neutron stars. For this boundary condition we calculate a maximum mass of 4.1 solar masses.
