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arXiv 2107.13871hep-thastro-ph.COgr-qc
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非微扰宇宙学自举法

Towards the non-perturbative cosmological bootstrap

Matthijs Hogervorst, João Penedones, Kamran Salehi Vaziri

摘要:

我们研究了de Sitter时空dS $_{d+1}$背景下的量子场论。我们的主要工具是希尔伯特空间分解在其等距群$SO(d+1,1)$的不可约酉表示。作为Hilbert空间形式的第一个应用,我们恢复了标量体两点函数的Källen-Lehmann谱分解。在这个过程中,我们展示了相应的谱密度和边界CFT数据的极点之间的关系。此外,我们还从球面上通过解析延拓导出了谱密度的反演公式,并用它求出了几个例子的谱分解。其次,我们研究了边界算子四点函数的共形分波分解。这些关联函数与标准共形场论的相关函数非常相似,但具有不同的正性性质,这些正性性质来自于德西特的么正性。最后,我们提出了一个非微扰共形引导方法来研究这些后期的四点函数,我们说明了我们的建议与具体的例子QFT在dS $_2$。

英文摘要:

We study quantum field theory on a de Sitter spacetime dS$_{d+1}$ background. Our main tool is the Hilbert space decomposition in irreducible unitary representations of its isometry group $SO(d+1,1)$. As the first application of the Hilbert space formalism, we recover the Källen-Lehmann spectral decomposition of the scalar bulk two-point function. In the process, we exhibit a relation between poles in the corresponding spectral densities and the boundary CFT data. Moreover, we derive an inversion formula for the spectral density through analytical continuation from the sphere and use it to find the spectral decompisiton for a few examples. Next, we study the conformal partial wave decomposition of the four-point functions of boundary operators. These correlation functions are very similar to the ones of standard conformal field theory, but have different positivity properties that follow from unitarity in de Sitter. We conclude by proposing a non-perturbative conformal bootstrap approach to the study of these late-time four-point functions, and we illustrate our proposal with a concrete example for QFT in dS$_2$.

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