Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: S-Matrices of Self-Dual Gravity   We use analyticity arguments to conjecture a one-loop gravity scattering
amplitude with an arbitrary number of external legs possessing the same
helicity. This result also gives the complete perturbative S-matrix of
self-dual gravity.

25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con