Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Duality and self-dual triplet solutions in Euclidean quantum gravity   Starting from the self-dual "triplet" of gravitational instanton solutions in
Euclidean gravity, we obtain the corresponding instanton solutions in string
theory by making use of the target space duality symmetry. These dual triplet
solutions can be obtained from the general dual Taub-NUT de Sitter solution
through some limiting procedure as in the pure gravity case. The dual
gravitational instanton solutions obtained here are self-dual for some cases,
with respect to certain isometries, but not always.

35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat