膨胀准二维偶极凝聚体中暴胀功率谱标度不变性的探讨
Probing the scale invariance of the inflationary power spectrum in expanding quasi-two-dimensional dipolar condensates
摘要：
我们考虑了超冷气体中的原子或分子间具有主导偶极-偶极相互作用的膨胀准二维玻色-爱因斯坦凝聚体中的类德西特宇宙。它表明，一个标志性的签名，暴胀宇宙学，尺度不变性的暴胀子场的相关性的功率谱，经历强烈的修改时，在膨胀的初始阶段，激发谱显示一个Roton最小值。因此，偶极量子气体提供了一个可行的实验室工具，实验研究，与明确定义和可控的初始条件，是否原始振荡光谱偏离洛伦兹不变性在trans-Planckian动量违反标准的暴胀宇宙学的预测。
英文摘要：
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.
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