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arXiv 1709.09671hep-thastro-ph.COgr-qchep-ph
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拓扑膨胀

Topological Inflation

Andrey O. Barvinsky, Ariel R. Zhitnitsky

摘要:

我们讨论了早期宇宙学的一种新情况,即暴胀准德西特相动态地起源于微正则密度矩阵表示的初始量子态。这种真正的量子效应是膨胀宇宙中强耦合类QCD规范理论中拓扑非平凡扇区动力学的结果。我们的建议的关键要素是存在于我们的框架中的一个非平凡的$\mathbb{S}^1$,它在建设中发挥双重作用:它定义了周期性的引力瞬子(在引力方面),它也定义了一个非平凡的规范holonomy(在规范方面)产生真空能量。这种效应本质上是全局的,不能用有效局部场论中的梯度展开来表示。我们还讨论了由于螺旋不稳定性而导致的完整暴胀的优雅退出。完整暴胀框架中的e折叠数由暴胀时刻的规范耦合常数决定,估计为$N_{\rm infl}\sim α^{-2}(H_0)\sim 10^2$。我们还评论了我们的框架与无边界和隧道宇宙学的建议和他们最近的批评的关系。

英文摘要:

We discuss a novel scenario for early cosmology, when the inflationary quasi-de Sitter phase dynamically originates from the initial quantum state represented by the microcanonical density matrix. This genuine quantum effect occurs as a result of the dynamics of the topologically nontrivial sectors in a (conjectured) strongly coupled QCD-like gauge theory in expanding universe. The crucial element of our proposal is the presence in our framework of a nontrivial $\mathbb{S}^1$ which plays the dual role in construction: it defines the periodic gravitational instanton (on the gravity side) and it also defines a nontrivial gauge holonomy (on the gauge side) generating the vacuum energy. The effect is global in nature and cannot be formulated in terms of a gradient expansion in an effective local field theory. We also discuss a graceful exit from holonomy inflation due to the helical instability. The number of e-folds in the holonomy inflation framework is determined by the gauge coupling constant at the moment of inflation, and estimated as $N_{\rm infl}\sim α^{-2}(H_0)\sim 10^2$. We also comment on the relation of our framework with the no-boundary and tunneling cosmological proposals and their recent criticism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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