In a primordial universe pre- (post-)inflationary era, there could be phases of early universe made of cold gas baryons, radiation and early post-inflationary cosmological constant. I showed that in the baryonic epoch, the quantum vacuum is unique. By using the standard quantization scheme for a massive minimally coupled scalar field with maximal conformal symmetry in the classical space–time, I demonstrated that the scalar modes had an effective mass [Formula: see text] (or [Formula: see text]). This argument was validated when the conformal time [Formula: see text] kept so close to the inflation ending time [Formula: see text]. The energy density of the baryonic matter diverged at the inflation border and vanishes at the late time future. Furthermore, I argued that at very early accelerating epoch when the radiation was the dominant part in the close competition with the early time cosmological constant, fine-tuned mass of the scalar field [Formula: see text] also provided a unique quantum vacuum. The reason is that the effective mass eventually is vanished. A remarkable observation was that all the other possible vacuum states “squeezed” eternally.

中文翻译：

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原始宇宙中无与伦比的量子真空

在原始宇宙的前（后）暴胀时代，可能存在由冷气体重子、辐射和暴胀后早期宇宙常数组成的早期宇宙阶段。我证明了在重子时代，量子真空是独一无二的。通过对经典时空中具有最大共形对称性的大规模最小耦合标量场使用标准量化方案，我证明了标量模式具有有效质量 [公式：参见文本]（或 [公式：参见文本]）。当保形时间[公式：见文本]保持如此接近暴胀结束时间[公式：见文本]时，这个论点得到了验证。重子物质的能量密度在暴胀边界处发散，并在未来后期消失。此外，我认为，在非常早期的加速时代，当辐射在与早期宇宙学常数的密切竞争中占主导地位时，标量场[公式：见正文]的微调质量也提供了独特的量子真空。原因是有效质量最终会消失。一个显着的观察结果是，所有其他可能的真空状态都被永远“挤压”了。