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Gravitational wave content and stability of uniformly rotating triaxial neutron stars in general relativity

机译:广义相对论中均匀旋转的三轴中子星的引力波含量和稳定性

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摘要

Targets for ground-based gravitational wave interferometers include continuous, quasiperiodic sources of gravitational radiation, such as isolated, spinning neutron stars. In this work, we perform evolution simulations of uniformly rotating, triaxially deformed stars, the compressible analogs in general relativity of incompressible, Newtonian Jacobi ellipsoids. We investigate their stability and gravitational wave emission. We employ five models, both normal and supramassive, and track their evolution with different grid setups and resolutions, as well as with two different evolution codes. We find that all models are dynamically stable and produce a strain that is approximately one-tenth the average value of a merging binary system. We track their secular evolution and find that all our stars evolve toward axisymmetry, maintaining their uniform rotation, rotational kinetic energy, and angular momentum profiles while losing their triaxiality.
机译:地面重力波干涉仪的目标包括连续的准周期性重力辐射源,例如孤立的旋转中子星。在这项工作中,我们执行均匀旋转的三轴变形恒星的演化模拟,这是不可压缩的牛顿雅各比椭圆体的广义相对论中的可压缩类似物。我们研究了它们的稳定性和引力波发射。我们使用正常和超被动的五个模型,并使用不同的网格设置和分辨率以及两个不同的演化代码跟踪它们的演化。我们发现所有模型都是动态稳定的,并且产生的应变约为合并二元系统平均值的十分之一。我们跟踪了它们的长期演化,发现我们所有的恒星都朝着轴对称方向发展,在保持其三轴性的同时,保持了它们均匀的旋转,旋转动能和角动量分布。

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