论文标题
d d d d d de Sitter空间
EFT for de Sitter Space
论文作者
论文摘要
De Sitter空间的物理学对于我们对宇宙学过去，现在和未来的理解至关重要。它构成了通过宇宙调查测试的量子真空波动的统计预测的基础。另外，宇宙的当前膨胀以明显恒定的真空能为主导，我们再次发现了由De Sitter时期描述的宇宙。尽管我们对宇宙学可观察的预测取得了成功，但关于保姆的性质的概念问题比比皆是，并且在弯曲背景下量子场理论和扰动量子重力的技术挑战加剧了。近年来，使用有效的现场理论技术进行了重大过程，以驯服这些扰动理论的分解。我们将讨论如何理解加速宇宙学背景产生的长波长波动，以及如何解决出现的UV和IR障碍。长波长的分歧通过EFT中的重新归一化组（RG）的流量重新定位。对于轻型标量场，RG流动将自己表现为随机通货膨胀形式主义。在单场通货膨胀中，长波长度量波动是在地平线到全环秩序之外保守的，可以通过功率计数和对称性轻松地以EFT来理解。
The physics of de Sitter space is essential to our understanding of our cosmological past, present, and future. It forms the foundation for the statistical predictions of inflation in terms of quantum vacuum fluctuations that are being tested with cosmic surveys. In addition, the current expansion of the universe is dominated by an apparently constant vacuum energy and we again find our universe described by a de Sitter epoch. Despite the success of our predictions for cosmological observables, conceptual questions of the nature of de Sitter abound and are exacerbated by technical challenges in quantum field theory and perturbative quantum gravity in curved backgrounds. In recent years, significant process has been made using effective field theory techniques to tame these breakdowns of perturbation theory. We will discuss how to understand the long-wavelength fluctuations produced by accelerating cosmological backgrounds and how to resolve both the UV and IR obstacles that arise. Divergences at long wavelengths are resummed by renormalization group (RG) flow in the EFT. For light scalar fields, the RG flow manifests itself as the stochastic inflation formalism. In single-field inflation, long-wavelength metric fluctuations are conserved outside the horizon to all-loop order, which can be understood easily in EFT terms from power counting and symmetries.
