Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Mellin Space Approach to Cosmological Correlators   We propose a Mellin space approach to the evaluation of late-time
momentum-space correlation functions of quantum fields in
$\left(d+1\right)$-dimensional de Sitter space. The Mellin-Barnes
representation makes manifest the analytic structure of late-time correlators
and, more generally, provides a convenient general $d$ framework for the study
of conformal correlators in momentum space. In this work we focus on tree-level
correlation functions of general scalars as a prototype, including $n$-point
contact diagrams and $4$-point exchanges. For generic scalars, both the contact
and exchange diagrams are given by (generalised) Hypergeometric functions,
which reduce to existing expressions available in the literature for $d=3$ and
external scalars which are either simultaneously conformally coupled or
massless. This approach can also be used for the perturbative bulk evaluation
of momentum-space boundary correlators in $\left(d+1\right)$-dimensional
anti-de Sitter space (Witten diagrams).

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The categories of this paper are: physics
14
The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph