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arXiv 2007.09993hep-thgr-qc
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从AdS到dS的交换:谱表示、梅林振幅和交叉

From AdS to dS Exchanges: Spectral Representation, Mellin Amplitudes and Crossing

Charlotte Sleight, Massimo Taronna

摘要:

我们提出了一个简单的一般关系树级交流AdS和dS。这种关系允许直接进口的技术和AdS威滕图的结果,无论是在位置和动量空间,边界关联函数在dS。在这项工作中,我们应用这种关系来定义梅林振幅和频谱表示交换dS。我们还推导出的dS交换的共形块分解,无论是在直接和交叉渠道,从他们的AdS同行。AdS和dS交换本身之间的关系是使用最近引入的Mellin-Barnes表示在动量空间中的边界扩散子导出的,其中(A)dS交换直接由因式分解,共形对称和边界条件的组合固定。

英文摘要:

We present a simple general relation between tree-level exchanges in AdS and dS. This relation allows to directly import techniques and results for AdS Witten diagrams, both in position and momentum space, to boundary correlation functions in dS. In this work we apply this relation to define Mellin amplitudes and a spectral representation for exchanges in dS. We also derive the conformal block decomposition of a dS exchange, both in the direct and crossed channels, from their AdS counterparts. The relation between AdS and dS exchanges itself is derived using a recently introduced Mellin-Barnes representation for boundary correlators in momentum space, where (A)dS exchanges are straightforwardly fixed by a combination of factorisation, conformal symmetry and boundary conditions.

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