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arXiv 1601.01460gr-qc
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双星中子星初始条件的共形平坦近似

Review of Conformally Flat Approximation for Binary Neutron Star Initial Conditions

InSaeng Suh, Grant J. Mathews, J. Reese Haywood, N. Q. Lan

摘要:

空间共形平坦近似(CFA)是一种利用完整的爱因斯坦方程推导双星中子星演化初始条件的可行方法。在这里,我们回顾的状态,原来的CFA制定的广义相对论流体动力学初始条件的双中子星。我们通过数值演化~100个准圆轨道来说明流体动力学共形平坦条件的稳定性。我们说明了使用这种近似的轨道中子星在准圆轨道近似证明这些初始条件的状态方程的依赖性,以及它们如何可能会影响紧急引力波频率的恒星接近最内部的稳定的圆形轨道。

英文摘要:

The spatially conformally flat approximation (CFA) is a viable method to deduce initial conditions for the subsequent evolution of binary neutron stars employing the full Einstein equations. Here we review the status of the original formulation of the CFA for the general relativistic hydrodynamic initial conditions of binary neutron stars. We illustrate the stability of the conformally flat condition on the hydrodynamics by numerically evolving ~100 quasi-circular orbits. We illustrate the use of this approximation for orbiting neutron stars in the quasi-circular orbit approximation to demonstrate the equation of state dependence of these initial conditions and how they might affect the emergent gravitational wave frequency as the stars approach the innermost stable circular orbit.

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