Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instantons, Monopoles, Strings and Fivebranes   We discuss three classes of solitonic solutions in string theory: instantons,
monopoles and string-like solitons. Instantons may provide a nonperturbative
understanding of the vacuum structure of string theory, while monopoles may
appear in string predictions for grand unification. The particular monopole
solution shown has finite action as the result of the cancellation of gauge and
gravitational singularities, a feature, which if it survives quantization, may
yield insight into the structure of string theory as a finite theory of quantum
gravity. In $D=10$, both monopoles and instantons possess fivebrane structure.
The string-like solitons represent extended states of fundamental strings.(
Talk given at INFN Eloisatron Project: 26th Workshop: ``From Superstrings to
Supergravity'', Erice, Italy, Dec. 5-12, 1992.)

27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph