A view of the bulk from the worldline

A view of the bulk from the worldline
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从世界线看大部分

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发表时间:
2017
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通讯作者:
Henry Maxfield
Henry Maxfield
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作者:
Henry Maxfield

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介绍了一种在一般维度下计算AdS$_{d + 1}$中关联函数的新方法,该方法考虑了在量子场论的世界线形式理论中量子化的一个粒子,它与体场(特别是以标准方式量子化的引力场)耦合。这给出了一种由小参数$G_N$和粒子的逆质量组织的系统的双参数微扰展开,它是对通常的维滕图展开的补充。这与共形场论(CFT)语言密切相关,全局共形块的测地线维滕图表示自然地出现,并且对于二维情况,给出了维拉索罗块的体表示以及一种计算量子修正的系统方法。结果表明,在任何维度下,全局共形块和其他贡献在关联函数中都呈现指数形式,这对应于任意圈阶的维滕图的各个部分。
A new method to compute correlation functions in AdS$_{d+1}$ in general dimension is introduced, considering a particle quantised in the worldline formalism of quantum field theory, coupled to bulk fields, in particular gravity, quantised in the standard manner. This gives a systematic two-parameter perturbative expansion organised by small parameters $G_N$ and the inverse mass of the particle, complementary to the usual Witten diagram expansion. This connects closely to CFT language, with the geodesic Witten diagram representation of global conformal blocks emerging naturally, and for two dimensions gives a bulk representation of the Virasoro block, with a systematic method for computing quantum corrections. The global conformal block and other contributions are shown to exponentiate in correlation functions in any dimension, corresponding to pieces of Witten diagrams at arbitrary loop order.