Critical Collapse of a Scalar Field in Semiclassical Loop Quantum Gravity
Critical Collapse of a Scalar Field in Semiclassical Loop Quantum Gravity
复制标题
半经典环量子引力中标量场的临界坍缩
DOI：
10.1103/physrevlett.124.071301
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发表时间：
2020
影响因子：
8.6
通讯作者：
Pullin, Jorge
中科院分区：
文献类型：
--
作者：
Benítez, Florencia;Gambini, Rodolfo;Lehner, Luis;Liebling, Steve;Pullin, Jorge
我们使用圈量子引力所期望的半经典方程来研究与引力最小耦合的无质量标量场的球对称性坍缩。我们发现临界行为的质量作为一个函数的初始数据的参数类似于Choptuik在经典广义相对论中发现的一个大的初始数据和聚合参数的值。与量子引力的广泛期望相反，我们的半经典场方程和经典场方程一样，具有精确的标度不变性。正如人们所期望的那样，我们在数值上发现相变是二阶的：同样，与经典情况一样。
We study the collapse in spherical symmetry of a massless scalar field minimally coupled to gravity using the semiclassical equations that are expected from loop quantum gravity. We find the critical behavior of the mass as a function of the parameters of the initial data similar to that found by Choptuik in classical general relativity for a large set of initial data and values of the polymerization parameter. Contrary to wide expectations for quantum gravity, our semiclassical field equations have an exact scale invariance, as do the classical field equations. As one would then expect, we numerically find that the phase transition is second order: again, as in the classical case.