Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multidimensional Classical and Quantum Wormholes in Models with
  Cosmological Constant   A multidimensional cosmological model with space-time consisting of $n (n \ge
2)$ Einstein spaces $M_{i}$ is investigated in the presence of a cosmological
constant $\Lambda$ and a homogeneous minimally coupled scalar field
$\varphi(t)$ as a matter source. Classical and quantum wormhole solutions are
obtained for $\Lambda < 0$ and all $M_{i}$ being Ricci-flat. Classical wormhole
solutions are also found for $\Lambda < 0$ and only one of the $M_{i}$ being
Ricci-flat for the case of spontaneous compactification of the internal
dimensions with fine tuning of parameters.

6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org