Probing the Scale Invariance of the Inflationary Power Spectrum in Expanding Quasi-Two-Dimensional Dipolar Condensates
Probing the Scale Invariance of the Inflationary Power Spectrum in Expanding Quasi-Two-Dimensional Dipolar Condensates
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DOI：
10.1103/physrevlett.118.130404
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发表时间：
2017-03-30
影响因子：
8.6
通讯作者：
Fischer, Uwe R.
中科院分区：
文献类型：
--
作者：
Cha, Seok-Yeong;Fischer, Uwe R.
我们考虑在膨胀的准二维玻色-爱因斯坦凝聚中的类似德西特宇宙，其在超冷气体中的原子或分子之间具有主要的偶极-偶极相互作用。研究表明，暴胀宇宙学的一个标志性特征，即暴胀场相关性的功率谱的尺度不变性，在膨胀的初始阶段，激发谱显示出旋子最小值时，会经历强烈的修改。因此，偶极量子气体提供了一种可行的实验室工具，可以在明确且可控的初始条件下通过实验研究偏离跨普朗克动量的洛伦兹不变性的原初振荡光谱是否违反暴胀宇宙学的标准预测。
We consider an analogue de Sitter cosmos in an expanding quasi-two-dimensional Bose-Einstein condensate with dominant dipole-dipole interactions between the atoms or molecules in the ultracold gas. It is demonstrated that a hallmark signature of inflationary cosmology, the scale invariance of the power spectrum of inflaton field correlations, experiences strong modifications when, at the initial stage of expansion, the excitation spectrum displays a roton minimum. Dipolar quantum gases thus furnish a viable laboratory tool to experimentally investigate, with well-defined and controllable initial conditions, whether primordial oscillation spectra deviating from Lorentz invariance at trans-Planckian momenta violate standard predictions of inflationary cosmology.