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arXiv 1609.02841gr-qcastro-ph.CO
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轴对称、自引力、耗散流体中非平衡的最早阶段

Earliest stages of the non-equilibrium in axially symmetric, self-gravitating, dissipative fluids

L. Herrera, A. Di Prisco, J. Ospino, J. Carot

摘要:

我们报告的轴向和反射对称耗散流体的研究,刚刚离开流体静力学和热平衡,在最小的时间尺度上,在动态演化的第一个迹象出现。这样的时间尺度小于热弛豫时间、热调整时间和流体静力学时间。结果表明,非平衡态的出现主要取决于一个与涡量时间导数直接相关的函数。在所有的流体变量(在考虑的时间尺度),只有四分量的各向异性张量在子空间正交的四-速度和Killing矢量的轴对称,显示出动态演化的迹象。此外,朝着耗散制度的第一步开始与非零的时间导数的热通量分量沿纬向方向。外尔张量的磁性部分消失了(而不是它的时间导数),这表明引力辐射的发射将在稍后的时间发生。最后,与热效应相关的有效惯性质量密度的减小被清楚地示出。

英文摘要:

We report a study on axially and reflection symmetric dissipative fluids, just after its departure from hydrostatic and thermal equilibrium, at the smallest time scale at which the first signs of dynamic evolution appear. Such a time scale is smaller than the thermal relaxation time, the thermal adjustment time and the hydrostatic time. It is obtained that the onset of non--equilibrium will critically depend on a single function directly related to the time derivative of the vorticity. Among all fluid variables (at the time scale under consideration), only the tetrad component of the anisotropic tensor in the subspace orthogonal to the four--velocity and the Killing vector of axial symmetry, shows signs of dynamic evolution. Also, the first step toward a dissipative regime begins with a non--vanishing time derivative of the heat flux component along the meridional direction. The magnetic part of the Weyl tensor vanishes (not so its time derivative), indicating that the emission of gravitational radiation will occur at later times. Finally, the decreasing of the effective inertial mass density, associated to thermal effects, is clearly illustrated.

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