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arXiv 1301.3111gr-qc
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具有小旋转差的慢转中子星:平衡模型和Cowling近似下的振荡

Slowly rotating neutron stars with small differential rotation: equilibrium models and oscillations in the Cowling approximation

Cecilia Chirenti, Jozef Skakala, Shin'ichirou Yoshida

摘要:

新生的中子星可以呈现出差异旋转,即使后来它应该被粘性或足够强的磁场所抑制。在中子星生命的早期阶段,预计它会发射出强烈的引力波,这可能会受到差速旋转的影响。我们在这里提出了一个新的形式主义差分旋转中子星的建模:慢旋转近似的工作,并假设一个小的程度的差分旋转,我们表明,它是可能的分离变量的爱因斯坦场方程。通过求解三个解耦的常微分方程确定惯性系的拖曳力。在建立了平衡模型之后,我们在Cowling近似下讨论了微分转动对中子星的f和r振荡模的影响,并分析了微分转动对f振荡模引力辐射的影响。我们看到,引力辐射的f-模式略有抑制引入微分旋转的平衡星。

英文摘要:

Newly born neutron stars can present differential rotation, even if later it should be suppressed by viscosity or a sufficiently strong magnetic field. And in this early stage of its life, a neutron star is expected to have a strong emission of gravitational waves, which could be influenced by the differential rotation. We present here a new formalism for modelling differentially rotating neutron stars: working on the slow rotation approximation and assuming a small degree of differential rotation, we show that it is possible to separate variables in the Einstein field equations. The dragging of inertial frames is determined by solving three decoupled ODEs. After we establish our equilibrium model, we explore the influence of the differential rotation on the f and r-modes of oscillation of the neutron star in the Cowling approximation, and we also analyze an effect of the differential rotation on the emission of gravitational radiation from the f-modes. We see that the gravitational radiation from the f-modes is slightly suppressed by introducing differential rotation to the equilibrium stars.

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