Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three Dimensional Black Hole Coupled to the Born-Infeld Electrodynamics   A nonlinear charged version of the (2+1)-anti de Sitter black hole solution
is derived. The source to the Einstein equations is a Born-Infeld
electromagnetic field, which in the weak field limit becomes the (2+1)-Maxwell
field. The obtained Einstein-Born-Infeld solution for certain range of the
parameters (mass, charge, cosmological and Born-Infeld constants) represent a
static circularly symmetric black hole. Although the covariant metric
components and the electric field do not exhibit a singular behavior at r=0 the
curvature invariants are singular at that point.

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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: solv-int