Do triaxial supramassive compact stars exist?
Do triaxial supramassive compact stars exist?
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三轴超大质量致密星是否存在？
DOI：
10.1103/physrevd.94.101302
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发表时间：
2016
影响因子：
5
通讯作者：
and S.i. Yoshida
中科院分区：
文献类型：
--
作者：
K. Uryu;A. Tsokaros;L. Baiotti;F. Galeazzi;N. Sugiyama;K. Taniguchi;and S.i. Yoshida
本文研究了相对论引力和可压缩状态方程下三轴变形旋转致密星的准平衡解-Jacobi椭球的推广。对于相对刚性（分段）多变的EOS，我们发现超大质量的三轴解决方案，其质量超过最大质量的球形解决方案，但总是低于那些轴对称平衡。三轴和轴对称解的最大质量的差异敏感地依赖于EOS。如果差别只有10%左右，这将是强有力的证据，表明高密度物质的状态方程在中子星的核心变得相当柔软。这一发现开辟了一种新的方法来探测高密度核物质的相变，使用探测引力波从新生的中子星或磁星下回落吸积。
We study quasiequilibrium solutions of triaxially deformed rotating compact stars—a generalization of Jacobi ellipsoids under relativistic gravity and compressible equations of state (EOSs). For relatively stiff (piecewise) polytropic EOSs, we find supramassive triaxial solutions whose masses exceed the maximum mass of the spherical solution, but are always lower than those of axisymmetric equilibriums. The difference in the maximum masses of triaxial and axisymmetric solutions depends sensitively on the EOSs. If the difference turns out to be only about 10%, it will be strong evidence that the EOS of high density matter becomes substantially softer in the core of neutron stars. This finding opens a novel way to probe phase transitions of high density nuclear matter using detections of gravitational waves from new born neutron stars or magnetars under fallback accretion.