Tunneling dynamics of an oscillating universe model
Tunneling dynamics of an oscillating universe model
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DOI：
10.1088/1475-7516/2022/05/007
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发表时间：
2021-10
影响因子：
6.4
通讯作者：
M. Bojowald;P. Petersen
中科院分区：
文献类型：
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作者：
M. Bojowald;P. Petersen
非绝热量子动力学的准经典方法可以揭示量子效应的新特征，如隧道演化，这些特征在基于定态波函数的标准处理中难以分析。本文将这些方法应用于最近引入的一个振荡宇宙模型。我们的准经典处理方法正确地描述了隧道状态的几个预期特征，特别是在隧道进入一个被困区域之前和之后，模型宇宙可能会在许多坍缩和膨胀周期中振荡。作为一个新的结果，发现振荡动力学比经典描述中的规则性要差得多，即使在物质成分及其参数不变的情况下，也显示出具有变化最大体积的连续周期。
Quasiclassical methods for non-adiabatic quantum dynamics can reveal new features of quantum effects, such as tunneling evolution, that are harder to analyze in standard treatments based on wave functions of stationary states. Here, these methods are applied to an oscillating universe model introduced recently. Our quasiclassical treatment correctly describes several expected features of tunneling states, in particular just before and after tunneling into a trapped region where a model universe may oscillate through many cycles of collapse and expansion. As a new result, the oscillating dynamics is found to be much less regular than in the classical description, revealing a succession of cycles with varying maximal volume even when the matter ingredients and their parameters do not change.