Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Gauss Map and 2+1 Gravity   We prove that the Gauss map of a surface of constant mean curvature embedded
in Minkowski space is harmonic. This fact will then be used to study 2+1
gravity for surfaces of genus higher than one. By considering the energy of the
Gauss map, a canonical transform between the ADM reduced variables and holonomy
variables can be constructed. This allows one to solve (in principle) for the
evolution in the ADM variables without having to explicitly solve the
constraints first.

26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin