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arXiv 2412.09211hep-thgr-qc
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de Sitter JT引力的DeWitt波函数

DeWitt wave functions for de Sitter JT gravity

Wilfried Buchmuller, Arthur Hebecker, Alexander Westphal

AI总结:

本文系统求解二维de Sitter JT引力微超空间WDW方程,构造具有Schwarzian渐近行为且在整个奇异边界消失的实解析波函数,支持DeWitt猜想并说明半经典波函数局限。

摘要:

二维de Sitter空间中的Jackiw-Teitelboim(JT)引力是用于研究宇宙学“宇宙波函数”的一个引人关注的模型。其微超空间版本已经包含所有物理信息。紧致切片的尺寸由尺度因子$h>0$参数化。伸缩子$ϕ$被选取为正值,即$ϕ>0$,并被解释为更高维理论中一个额外紧致切片的尺寸。在边界$h=0$、$ϕ=0$处,宇宙体积消失,曲率通常是奇异的。根据DeWitt的一个猜想,Wheeler-DeWitt(WDW)方程的解应当在奇异轨迹处消失。最近,JT波函数在大场值$h$、$ϕ$处的行为已通过对边界曲线的Schwarzian自由度进行路径积分而得到。我们系统分析了具有Schwarzian渐近行为的WDW方程解。我们发现了在整个边界上均消失的实解析解,这与DeWitt猜想一致。向膨胀分支和收缩分支的投影可能导致奇异性,但通过适当叠加解可以避免这些奇异性。我们的分析也阐明了半经典波函数的局限性。

英文摘要:

Jackiw-Teitelboim (JT) gravity in two-dimensional de Sitter space is an intriguing model for cosmological "wave functions of the universe". Its minisuperspace version already contains all physical information. The size of compact slices is parametrized by a scale factor $h > 0$. The dilaton $ϕ$ is chosen to have positive values, $ϕ> 0$, and interpreted as size of an additional compact slice in a higher-dimensional theory. At the boundaries $h=0$, $ϕ=0$, where the volume of the universe vanishes, the curvature is generically singular. According to a conjecture by DeWitt, solutions of the Wheeler-DeWitt (WDW) equation should vanish at singular loci. Recently, the behaviour of JT wave functions at large field values $h$, $ϕ$ has been obtained by means of a path integral over Schwarzian degrees of freedom of a boundary curve. We systematically analyze solutions of the WDW equation with Schwarzian asymptotic behaviour. We find real analytic solutions that vanish on the entire boundary, in agreement with DeWitt's conjecture. Projection to expanding and contracting branches may lead to singularities, which can however be avoided by an appropriate superposition of solutions. Our analysis also illustrates the limitations of semiclassical wave functions.

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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