Effect of spin on the inspiral of binary neutron stars
Effect of spin on the inspiral of binary neutron stars
复制标题
DOI：
10.1103/physrevd.100.024061
复制
发表时间：
2019-05
影响因子：
5
通讯作者：
A. Tsokaros;M. Ruiz;V. Paschalidis;S. Shapiro;K. Uryū
中科院分区：
文献类型：
--
作者：
A. Tsokaros;M. Ruiz;V. Paschalidis;S. Shapiro;K. Uryū
我们对自转的双中子星进行了长期的模拟，我们的最高无量纲自转是$\EnsureMath{\chi}\EnsureMath{\sim}0.32$。为了评估自旋在自旋过程中的重要性，我们改变了自旋，并使用了两个状态方程，一个由普通核物质组成，产生致密恒星(SLY)，以及一个混合状态方程，包含核物质和夸克物质，导致更大的恒星(ALF2)。在最精细层次上使用具有网格间距$\mathrm{\ensuremath{\Delta}}x\ensuremath{\sim}98\text{}\Text{}\mathm{m}的高分辨率，我们发现自旋在双星系统相演化中的影响可能比来自潮汐作用力的影响更大。我们的计算清楚地表明，尽管潮汐效应对小自旋(0.1美元)起主导作用，但当自旋更大时，这不再是正确的，但仍然远远小于开普勒式极限。
We perform long-term simulations of spinning binary neutron stars, with our highest dimensionless spin being $\ensuremath{\chi}\ensuremath{\sim}0.32$. To assess the importance of spin during the inspiral, we vary the spin and also use two equations of state, one that consists of plain nuclear matter and produces compact stars (SLy) and a hybrid one that contains both nuclear and quark matter and leads to larger stars (ALF2). Using high resolution that has grid spacing $\mathrm{\ensuremath{\Delta}}x\ensuremath{\sim}98\text{ }\text{ }\mathrm{m}$ on the finest refinement level, we find that the effects of spin in the phase evolution of a binary system can be larger than the one that comes from tidal forces. Our calculations demonstrate explicitly that although tidal effects are dominant for small spins ($\ensuremath{\lesssim}0.1$), this is no longer true when the spins are larger, but still much smaller than the Keplerian limit.