Over the last few years, low- and high-redshift observations set off tensions in the measurement of the present-day expansion rate and in the determination of the amplitude of the matter clustering in the late Universe (parameterized by ). It was recently noted that both these tensions can be resolved if the cosmological constant parametrizing the dark energy content switches its sign at a critical redshift . However, the anti-de Sitter (AdS) swampland conjecture suggests that the postulated switch in sign of the cosmological constant at zero temperature seems unlikely because the AdS vacua are an infinite distance apart from de Sitter (dS) vacua in moduli space. We provide an explanation for the required AdS → dS crossover transition in the vacuum energy using the Casimir forces of fields inhabiting the bulk. We then use entropy arguments to claim that any AdS → dS transition between metastable vacua must be accompanied by a reduction of the species scale where gravity becomes strong. We provide a few examples supporting this AdS → dS uplift conjecture.

中文翻译：

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由卡西米尔力驱动的反德西特→德西特转变并减轻宇宙学参数的张力


在过去的几年中，低红移和高红移观测引发了当前膨胀率测量和晚宇宙物质簇振幅确定（参数化）方面的紧张。最近有人指出，如果参数化暗能量含量的宇宙常数在临界红移处改变其符号，那么这两种紧张关系都可以得到解决。然而，反德西特（AdS）沼泽地猜想表明，假定的零温度下宇宙常数符号的转变似乎不太可能，因为在模空间中，AdS 真空与德西特（dS）真空相距无限远。我们利用本体中场的卡西米尔力对真空能量中所需的 AdS → dS 交叉转变进行了解释。然后，我们使用熵论证来断言亚稳态真空之间的任何 AdS → dS 转变都必须伴随着重力变强的物种尺度的减小。我们提供了一些例子来支持 AdS → dS 提升猜想。