We study the phenomenology of a recent string construction with a quantum mechanically stable dark energy. A mild supersymmetry protects the vacuum energy but also allows TeV scale superpartner masses. The construction is holographic in the sense that the 4D spacetime is generated from “spacetime pixels” originating from five‐branes wrapped over metastable five‐cycles of the compactification. The cosmological constant scales as in the pixel number. An instability in the construction leads to cosmic expansion. This also causes more five‐branes to wind up in the geometry, leading to a slowly decreasing cosmological constant which we interpret as an epoch of inflation followed by (pre‐)heating when a rare event occurs in which the number of pixels increases by an order one fraction. The sudden appearance of radiation triggers an exponential increase in the number of pixels. Dark energy has a time varying equation of state with , which is compatible with current bounds, and could be constrained further by future data releases. The pixelated nature of the Universe also implies a large‐l cutoff on the angular power spectrum of cosmological observables with . We also use this pixel description to study the thermodynamics of de Sitter space, finding rough agreement with effective field theory considerations.

中文翻译：

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像素化暗能量

我们研究了具有量子机械稳定暗能量的新型弦结构的现象学。温和的超对称性可以保护真空能量，但也可以使TeV规模的超级伙伴获得质量。这种构造是全息的，因为4D时空是由“时空像素”生成的，“时空像素”来自包裹在压实的亚稳态5个循环上的5根大脑。宇宙常数为在像素数中。结构的不稳定性会导致宇宙膨胀。这也会导致更多的五星几何图形缠绕，导致宇宙常数逐渐减小，我们将其解释为膨胀的纪元，然后在罕见事件发生时（预）加热，其中像素数量增加一个订购一小部分。辐射的突然出现触发了像素数量的指数增长。暗能量的时变状态方程为，与当前范围兼容，并且将来的数据发布可能会进一步限制它。宇宙的像素化性质还意味着宇宙可观测物的角功率谱上的大l截止。我们还使用该像素描述来研究de Sitter空间的热力学，找到与有效场论考虑因素大致一致的结果。