Cosmological consequences of Omnia Sequestra
Cosmological consequences of Omnia Sequestra
复制标题
DOI：
10.1088/1475-7516/2019/06/017
复制
发表时间：
2019-03
影响因子：
6.4
通讯作者：
B. Coltman;Yixuan Li;Antonio Padilla
中科院分区：
文献类型：
--
作者：
B. Coltman;Yixuan Li;Antonio Padilla
真空能量隔离是一种抵消真空能量辐射修正的机制。在[1]中提出的最全面的低能模型能够抵消物质和引力子环对真空能量的辐射修正，这与早期的建议相反。在这里，我们探索这个模型的框架和宇宙学后果，我们称之为Omnia Sequestra，因为它有能力隔离一切。对宇宙学背景下的历史积分的计算揭示了一些在早期模型中看不到的紫外线敏感性的微妙之处，但这些微妙之处在一个足够古老的宇宙中被驯服了。对于这些旧宇宙，我们估计的辐射稳定的剩余宇宙学常数的大小，并表明它不超过我们今天的宇宙的临界密度。我们还研究了相变的影响，均匀和非均匀的，并发现一般的时空区域与一个小的宇宙常数不需要对过渡的规模进行微调，现在看到的结果是持有所有模型的隔离。该模型以其他方式开发，从与通货膨胀的兼容性，到正确包含边界和某些边界数据选择的几何后果。
Vacuum energy sequestering is a mechanism for cancelling off the radiative corrections to vacuum energy. The most comprehensive low energy model, proposed in [1], has the ability to cancel off radiative corrections to vacuum energy for loops of both matter and gravitons, in contrast to earlier proposals. Here we explore the framework and cosmological consequences of this model, which we call Omnia Sequestra, owing to its ability to sequester all. A computation of historic integrals on a cosmological background reveals some subtleties with UV sensitivity not seen in earlier models, but which are tamed in a Universe that grows sufficiently old. For these old Universes, we estimate the size of the radiatively stable residual cosmological constant and show that it does not exceed the critical density of our Universe today. We also study the effect of phase transitions, both homogeneous and inhomogeneous, and find that generically spacetime regions with a small cosmological constant do not need to be fine-tuned against the scale of the transition, a result which is now seen to hold across all models of sequestering. The model is developed in other ways, from its compatibility with inflation, to the correct inclusion of boundaries and the geometric consequences of certain choices of boundary data.