Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantising general relativity using QED theory   We apply QED theory to quantum gravity and find it leads to general
relativity in the classical limit. We discuss the implications of the result
for the quantum-classical divide. This enables us to relate our result to
M-theory.

14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph