How the spacetime evolved non-perturbatively in a landscape with multiple anti-de Sitter (AdS) vacua, which is theoretically well-motivated, has always been a matter of concern. As a step towards this issue, we perform (3+1)D numerical relativity simulations for the inhomogeneous universe in an AdS landscape, and find that large inhomogeneity of scalar field can develop into not only sphere-like bubbles, but also novel tube-like structures. It is observed that the bubble or tube wall (across the potential barrier) likely inflates as a quasi-dS space, while the different regions separated by the walls are in different AdS vacua and will collapse towards singularity.

中文翻译：

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论反德西特景观中的原始宇宙


时空如何在具有多个反德西特（AdS）真空的景观中非扰动演化，这在理论上是有充分理由的，一直是一个令人关注的问题。作为解决这个问题的一步，我们对 AdS 景观中的不均匀宇宙进行了 (3+1)D 数值相对论模拟，发现标量场的大不均匀性不仅可以发展成球状气泡，还可以发展成新型管状气泡。像结构一样。据观察，气泡或管壁（穿过势垒）可能会膨胀为准 dS 空间，而由壁分隔的不同区域处于不同的 AdS 真空中，并将向奇点塌陷。