发表机构
Università di Milano-Bicocca; INFN, sezione di Milano-Bicocca; Uppsala University; Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)（米兰比可卡大学; 意大利国家核物理研究所米兰比可卡分部; 乌普萨拉大学; 马克斯·普朗克物理研究所（维尔纳·海森堡研究所））
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究M理论非超对称AdS5紧化中的暗气泡情景，发现旗流形上非超对称真空在M5-膜气泡成核下不稳定，通过调节通量可实现参数化小的宇宙学常数，并建立膜上宇宙学常数与额外维度尺度的关系。
AI 中文摘要
在AdS$_5$中膨胀的气泡具有dS$_4$几何；暗气泡情景探讨这是否可能是我们的宇宙。受此启发，我们考虑M理论新的非超对称AdS$_5$紧化，并研究其非微扰不稳定性。我们聚焦于旗流形上的紧化。在通量景观的某些区域，非超对称真空在包裹内二循环的M5-膜气泡成核下变得不稳定，从而实现暗气泡情景。通过调节内部通量，气泡上的宇宙学常数可以参数化地变得很小，使M5-膜接近极端性界限。该解通过$R^{-1}\sim \Lambda_4^{1/4}$（以4维普朗克单位）将膜上诱导的宇宙学常数与额外维度的典型最大长度尺度联系起来，允许额外维度达到数十微米的量级。我们还考虑了各种替代方案，由于各种原因，这些方案目前并不那么成功。
英文摘要
An expanding bubble in AdS$_5$ has a dS$_4$ geometry; the dark bubble scenario explores whether this can be our Universe. Motivated by this, we consider new non-supersymmetric AdS$_5$ compactifications of M-theory and investigate their non-perturbative instabilities. We focus on a compactification on the flag manifold. In certain regions of the flux landscape, the non-supersymmetric vacua become unstable under the nucleation of M5-brane bubbles wrapping an internal two-cycle, thus realising the dark bubble scenario. The cosmological constant on the bubble can be made parametrically small by tuning the internal fluxes, making the M5-branes close to the extremality bound. The solution relates the induced cosmological constant on the brane and the typical largest length scale of the extra dimensions through $R^{-1}\sim Λ_4^{1/4}$ in 4d Planck units, allowing for extra dimensions of the order of tens of microns. We also consider various alternatives, which for various reasons are currently not as successful.
