Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The ground-state of General Relativity, Topological Theories and Dark
  Matter   We suggest a limit of Einstein equations incorporating the state
$g_{\mu\nu}=0$ as a solution. The large scale behavior of this theory has
interesting properties. For a spherical source, the velocity profile for
circular motions is of the form observed in galaxies (approximately flat). For
FRW cosmologies, the Friedman equation contains an additional contribution in
the matter sector.

13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
2
The categories of this paper are: math