Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2D dilaton gravity made compact   We show that the equations of motion of two-dimensional dilaton gravity
conformally coupled to a scalar field can be reduced to a single non-linear
second-order partial differential equation when the coordinates are chosen to
coincide with the two scalar fields, the matter field $f$ and the dilaton
$\phi$, which are present in the theory. This result may help solve and
understand two- and higher-dimensional classical and quantum gravity.

28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph