Damped Perturbations in the No-Boundary State.
Damped Perturbations in the No-Boundary State.
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无边界状态中的阻尼扰动。
DOI：
10.1103/physrevlett.121.081302
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发表时间：
2018
影响因子：
8.6
通讯作者：
Yannick Vreys
中科院分区：
文献类型：
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作者：
Juan Diaz Dorronsoro;J. Halliwell;J. Hartle;T. Hertog;Oliver Janssen;Yannick Vreys
我们在具有两个尺度因子的比安奇IX型超小空间中精确地计算了无边界路径积分。在这个模型中，无边界的建议可以通过要求一个比例因子初始为零，以及明智地选择与第二个比例因子共轭的动量的正则性条件来实现。考虑到扰动的非线性反作用，我们恢复了原来的半经典无边界提案的预测。特别是，我们发现，大扰动是强阻尼，符合真空态波函数。
We evaluate the no-boundary path integral exactly in a Bianchi type IX minisuperspace with two scale factors. In this model the no-boundary proposal can be implemented by requiring one scale factor to be zero initially together with a judiciously chosen regularity condition on the momentum conjugate to the second scale factor. Taking into account the nonlinear backreaction of the perturbations we recover the predictions of the original semiclassical no-boundary proposal. In particular we find that large perturbations are strongly damped, consistent with vacuum state wave functions.