arXiv 2010.040832020-10hep-thgr-qchep-ph

第五维空间的相变

Phase Transitions from the Fifth Dimension

Kaustubh Agashe, Peizhi Du, Majid Ekhterachian, Soubhik Kumar, Raman Sundrum

备注：: journal version
发表信息：: JHEP 02 (2021) 051
DOI：: 10.1007/JHEP02(2021)051

摘要：

我们研究了5D翘曲紧致化的宇宙学转变，从高温的黑膜相到低温的Randall-Sundrum I相。这种转变是通过从黑膜层成核的红外膜气泡的渗透进行的。剧烈的气泡动力学可以是可观测到的随机引力波的强大来源。虽然气泡成核在5D重力中是非微扰的，但它可以在两个阶段之间插入的“反弹”配置方面进行半经典处理。我们演示了如何这样的反弹配置可以足够平滑，以保持5D有效场论控制，以及如何一个简单的animals为它放置一个严格的下限在薄壁政权的过渡率，并给出合理的估计更普遍。当应用于层次问题时，扭曲喉道的最小Goldberger-Wise稳定性导致具有显著过冷的缓慢转变。我们证明了一个简单的概括的Goldberger-Wise潜力修改IR膜动力学，使过渡完成更迅速。过冷决定了在过渡之前产生的任何（暗）物质丰度的稀释，这可能与数据不符，而更快的过渡解决了这种紧张局势。我们讨论了不同的可能性对引力波信号强度的影响。通过AdS/CFT对偶性，翘曲跃迁给出了4D复合希格斯（去）约束跃迁的理论上易于处理的全息描述。我们的推广戈德堡明智的机制是双重的，具体的模型，我们早先的建议，其中复合动力学是由单独的UV和IR RG固定点。我们引入的平滑5D反弹配置补充了我们早期工作中提出的4D介子/radion优势推导。

英文摘要：

We study the cosmological transition of 5D warped compactifications, from the high-temperature black-brane phase to the low-temperature Randall-Sundrum I phase. The transition proceeds via percolation of bubbles of IR-brane nucleating from the black-brane horizon. The violent bubble dynamics can be a powerful source of observable stochastic gravitational waves. While bubble nucleation is non-perturbative in 5D gravity, it is amenable to semiclassical treatment in terms of a "bounce" configuration interpolating between the two phases. We demonstrate how such a bounce configuration can be smooth enough to maintain 5D effective field theory control, and how a simple ansatz for it places a rigorous lower-bound on the transition rate in the thin-wall regime, and gives plausible estimates more generally. When applied to the Hierarchy Problem, the minimal Goldberger-Wise stabilization of the warped throat leads to a slow transition with significant supercooling. We demonstrate that a simple generalization of the Goldberger-Wise potential modifies the IR-brane dynamics so that the transition completes more promptly. Supercooling determines the dilution of any (dark) matter abundances generated before the transition, potentially at odds with data, while the prompter transition resolves such tensions. We discuss the impact of the different possibilities on the strength of the gravitational wave signals. Via AdS/CFT duality the warped transition gives a theoretically tractable holographic description of the 4D Composite Higgs (de)confinement transition. Our generalization of the Goldberger-Wise mechanism is dual to, and concretely models, our earlier proposal in which the composite dynamics is governed by separate UV and IR RG fixed points. The smooth 5D bounce configuration we introduce complements the 4D dilaton/radion dominance derivation presented in our earlier work.

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