Higher-Spin Quartic Vertices in AdS5: a Rectangular Limit

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We determine the form of a significantly large class of gauge-invariant quartic vertices for symmetric higher-spin fields (in Vasiliev formalism) in AdS5 space in the rectangular limit, (defined in the paper) using the higher-spin vertex operators in superstring theory, which construction is based on the generators of the higher-spin symmetry algebra, enveloping the AdS isometries. In this limit, a particular simplification is that the quartic vertices do not receive corrections from worldsheet renormalization group flows of the cubic terms, so their structure is fixed directly by the 4-point amplitudes in superstring theory.