标题： 量子压缩和膨胀罗伯逊-沃尔克宇宙中大质量场的晚期经典行为 显示英文标题

标题： Quantum Squeezing and Late Time Classical Behavior of Massive Fields in Expanding Robertson-Walker Universe

摘要： 一种对时间依赖量子振荡器的薛定谔图像分析，以古思和皮的方式，明确识别了早期宇宙中真空涨落可能退相干的两种物理机制：将量子振荡器倒置，以及快速压缩倒置的振荡器，使得某些压缩因子发散。 在暴胀宇宙学中，前一种机制解释了轻量暴胀子的随机演化以及大多数暴胀模型中密度扰动的经典性质，而后者则负责相对较重场的经典演化，其质量处于略高于哈勃参数的狭窄范围内：2 < (m/H_0)^2 < 9/4。 同样的方法可以用于研究任何罗伯逊-沃尔克宇宙学中的量子涨落退相干。 显示英文摘要

摘要： A Schroedinger picture analysis of time dependent quantum oscillators, in a manner of Guth and Pi, clearly identifies two physical mechanisms for possible decoherence of vacuum fluctuations in early universe: turning of quantum oscillators upside-down, and rapid squeezing of upside-right oscillators so that certain squeezing factor diverges. In inflationary cosmology the former mechanism explains the stochastic evolution of light inflatons and the classical nature of density perturbations in most of inflationary models, while the later one is responsible for the classical evolution of relatively heavy fields, with masses in a narrow range above the Hubble parameter: 2 < (m/H_0)^2 < 9/4. The same method may be applied to study of the decoherence of quantum fluctuations in any Robertson-Walker cosmology.