Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to Create a 2-D Black Hole   The interaction of a cosmic string with a four-dimensional stationary black
hole is considered. If a part of an infinitely long string passes close to a
black hole it can be captured. The final stationary configurations of such
captured strings are investigated. A uniqueness theorem is proved, namely it is
shown that the minimal 2-D surface $\Sigma$ describing a captured stationary
string coincides with a {\it principal Killing surface}, i.e. a surface formed
by Killing trajectories passing through a principal null ray of the Kerr-Newman
geometry. Geometrical properties of principal Killing surfaces are investigated
and it is shown that the internal geometry of $\Sigma$ coincides with the
geometry of a 2-D black or white hole ({\it string hole}). The equations for
propagation of string perturbations are shown to be identical with the
equations for a coupled pair of scalar fields 'living' in the spacetime of a
2-D string hole. Some interesting features of physics of 2-D string holes are
described. In particular, it is shown that the existence of the extra
dimensions of the surrounding spacetime makes interaction possible between the
interior and exterior of a string black hole; from the point of view of the 2-D
geometry this interaction is acausal. Possible application of this result to
the information loss puzzle is briefly discussed.

31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org