Quantum primordial standard clocks
Quantum primordial standard clocks
复制标题
量子原始标准钟
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Yi Wang
中科院分区：
文献类型：
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作者：
Xingang Chen;M. H. Namjoo;Yi Wang
在本文中，我们指出并研究了存在于原始宇宙模型中的一种通用类型的信号，它可以用来独立于模型区分暴胀情景和替代方案。这些信号是由作为标准时钟的大规模场产生的。大质量场作为标准钟的作用在以前的工作中已经实现。虽然这种大质量场的存在是普遍的，但以前的实现需要尖锐的特征来经典地激发大质量时钟场的振荡。在这里，我们指出，大质量场的量子涨落实际上可以起到与标准时钟相同的作用。我们表明，他们也能够直接记录的场景类型的定义属性，即，作为时间的函数的原始宇宙的尺度因子a（t），但通过非高斯形状依赖的振荡功能。由于量子涨落质量场存在于任何现实的原始宇宙模型中，这些量子原始标准时钟信号存在于任何暴胀模型中，并且应该在暴胀的替代方案中也普遍存在。然而，这种信号的幅度是非常依赖于模型的。
In this paper, we point out and study a generic type of signals existing in the primordial universe models, which can be used to model-independently distinguish the inflation scenario from alternatives. These signals are generated by massive fields that function as standard clocks. The role of massive fields as standard clocks has been realized in previous works. Although the existence of such massive fields is generic, the previous realizations require sharp features to classically excite the oscillations of the massive clock fields. Here, we point out that the quantum fluctuations of massive fields can actually serve the same purpose as the standard clocks. We show that they are also able to directly record the defining property of the scenario type, namely, the scale factor of the primordial universe as a function of time a(t), but through shape-dependent oscillatory features in non-Gaussianities. Since quantum fluctuating massive fields exist in any realistic primordial universe models, these quantum primordial standard clock signals are present in any inflation models, and should exist quite generally in alternative-to-inflation scenarios as well. However, the amplitude of such signals is very model-dependent.