Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topology changing processes and symmetries of string effective action   Wormhole solutions corresponding to space-time geometries $R^1\times
S^1\times S^2$ and $R^1\times S^3$ are obtained from reduced string effective
action and the action is written in a manifestly $O(d,d)$ invariant form. A
general treatment is given for obtaining wormhole solutions of different
topologies from dimensional reduction. For specific ansatz of internal metric
and antisymmetric field the reduced action is shown to have a global $SL(2,C)$
symmetry. The $SL(2,C)$ and duality symmetries have been exploited to generate
new configurations of internal fields which produce wormhole solutions in four
space-time dimensions. The $SL(2,C)$ symmetry discussed in this paper arises
due to specific form of the moduli and these transformations belong to a
subgroup of $O(d,d)$ global symmetry.

33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph