Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Hamiltonian Formulation of Topological Gravity   Topological gravity is the reduction of Einstein's theory to spacetimes with
vanishing curvature, but with global degrees of freedom related to the topology
of the universe. We present an exact Hamiltonian lattice theory for topological
gravity, which admits translations of the lattice sites as a gauge symmetry.
There are additional symmetries, not present in Einstein's theory, which kill
the local degrees of freedom. We show that these symmetries can be fixed by
choosing a gauge where the torsion is equal to zero. In this gauge, the theory
describes flat space-times. We propose two methods to advance towards the holy
grail of lattice gravity: A Hamiltonian lattice theory for curved space-times,
with first-class translation constraints.

28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat