Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Introduction to the Brane World   The study of the so called brane world models has introduced completely new
ways of looking up on standard problems in many areas of theoretical physics.
Inspired in the recent developments of string theory, the Brane World picture
involves the introduction of new extra dimensions beyond the four we see, which
could either be compact or even open (infinite). The sole existence of those
new dimensions may have non trivial observable effects in short distance
gravity experiments, as well as in our understanding of the cosmology of the
early Universe, among many other issues. The goal of the present notes is to
provide a short introduction to some basic aspects of the Brane World models.
The discussion includes models with flat compact extra dimensions, as well as
the so called Randall-Sundrum models.

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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: q-alg