标题： 热意大利面：粘性引力坍缩 显示英文标题

标题： Hot Spaghetti: Viscous Gravitational Collapse

摘要： 我们探讨了物质落入宏观 Schwarzschild 黑洞时的结局，考虑了一个简化的情况，即径向坍缩的薄球壳，此时几何体的反作用可以忽略。 我们在粘性相对论流体力学的框架内研究了下落物质的内部动力学，并计算了坍缩物质在向 Schwarzschild 奇点下落时内部温度如何演变。 我们发现，当耗散的径向压力超过热压力且总径向压力变为负值时，或者作用在坍缩物质上的潮汐力的变化时间尺度短于特征流体动力学响应时间时，粘性流体力学会失效。 显示英文摘要

摘要： We explore the fate of matter falling into a macroscopic Schwarzschild black hole for the simplified case of a radially collapsing thin spherical shell for which the back reaction of the geometry can be neglected. We treat the internal dynamics of the infalling matter in the framework of viscous relativistic hydrodynamics and calculate how the internal temperature of the collapsing matter evolves as it falls toward the Schwarzschild singularity. We find that viscous hydrodynamics fails when either, the dissipative radial pressure exceeds the thermal pressure and the total radial pressure becomes negative, or the time scale of variation of the tidal forces acting on the collapsing matter becomes shorter than the characteristic hydrodynamic response time.