Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge/gravity duality   We review the emergence of gravity from gauge theory in the context of
AdS/CFT duality. We discuss the evidence for the duality, its lessons for
gravitational physics, generalizations, and open questions.

24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ