Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multidimensional Quantum Cosmology: Quantum Wormholes, Third
  Quantization, Inflation from "Nothing", etc   A multidimensional cosmological model with space-time consisting of n (n>1)
Einstein spaces M_i is investigated in the presence of a cosmological constant
Lambda and m homogeneous minimally coupled scalar fields as a matter source.
Classes of the models integrable at classical as well as quantum levels are
found. These classes are equivalent to each other. Quantum wormhole solutions
are obtained for them and the procedure of the third quantization is performed.
An inflationary universe arising from classically forbidden Euclidean region is
investigated for a model with a cosmological constant.

1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn