Critical phenomena in the aspherical gravitational collapse of radiation fluids
Critical phenomena in the aspherical gravitational collapse of radiation fluids
复制标题
辐射流体非球面引力塌缩的关键现象
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. J. Montero
中科院分区：
文献类型：
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作者：
T. Baumgarte;P. J. Montero
我们研究辐射流体引力坍缩的临界现象。我们进行数值模拟，在球对称和轴对称，并观察临界缩放超临界演化，这导致形成一个黑洞，和亚临界演化，在这种情况下，流体分散到无穷大，留下平坦的空间。我们确定了球对称坍缩的临界解，找到了它的普遍性的证据，并研究了在缺乏球对称的情况下，这个临界解的方法。对于我们考虑的情况下，非球面偏离球对称的临界解衰减阻尼振荡的方式是一致的，发现冈拉克在微扰计算的行为。我们的模拟进行了无约束的进化代码，实现在球极坐标系中，并采用“移动穿刺”坐标。
We study critical phenomena in the gravitational collapse of a radiation fluid. We perform numerical simulations in both spherical symmetry and axisymmetry, and observe critical scaling in both supercritical evolutions, which lead to the formation of a black hole, and subcritical evolutions, in which case the fluid disperses to infinity and leaves behind flat space. We identify the critical solution in spherically symmetric collapse, find evidence for its universality, and study the approach to this critical solution in the absence of spherical symmetry. For the cases that we consider, aspherical deviations from the spherically symmetric critical solution decay in damped oscillations in a manner that is consistent with the behavior found by Gundlach in perturbative calculations. Our simulations are performed with an unconstrained evolution code, implemented in spherical polar coordinates, and adopting "moving-puncture" coordinates.