Editing AdS/CFT correspondence (section)

=== Higher spin gauge theories ===

The AdS/CFT correspondence is closely related to another duality conjectured by Igor Klebanov and Alexander Markovich Polyakov in 2002.{{sfn|ps=|Klebanov|Polyakov|2002}} This duality states that certain "higher spin gauge theories" on anti-de&nbsp;Sitter space are equivalent to conformal field theories with [[orthogonal group|O(N)]] symmetry. Here the theory in the bulk is a type of gauge theory describing particles of arbitrarily high spin. It is similar to string theory, where the excited modes of vibrating strings correspond to particles with higher spin, and it may help to better understand the string theoretic versions of AdS/CFT and possibly even [[mathematical proof|prove]] the correspondence.{{refn|See the Introduction in {{harvnb|Klebanov|Polyakov|2002}}.}} In 2010, Simone Giombi and Xi Yin obtained further evidence for this duality by computing quantities called [[correlation function (quantum field theory)|three-point functions]].{{sfn|ps=|Giombi|Yin|2010}}