Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mesons in Gauge/Gravity Duals - A Review   We review recent progress in studying mesons within gauge/gravity duality, in
the context of adding flavour degrees of freedom to generalizations of the
AdS/CFT correspondence. Our main focus is on the `top-down approach' of
considering models constructed within string theory. We explain the
string-theoretical constructions in detail, aiming at non-specialists. These
give rise to a new way of describing strongly coupled confining large N gauge
gauge theories similar to large N QCD. In particular, we consider gravity dual
descriptions of spontaneous chiral symmetry breaking, and compare with lattice
results. A further topic covered is the behaviour of flavour bound states in
finite temperature field theories dual to a gravity background involving a
black hole. We also describe the `bottom up' phenomenological approach to
mesons within AdS/QCD. -- Some previously unpublished results are also
included.

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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: cs