A folded string with imaginary AdS radius is proposed as a bulk dual of SYK, reproducing the known operator spectrum via a Pöschl-Teller equation with SYK-tuned parameters.
Segmented strings coupled to a B-field
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In this paper we study segmented strings in AdS$_3$ coupled to a background two-form whose field strength is proportional to the volume form. By changing the coupling, the theory interpolates between the Nambu-Goto string and the $SL(2)$ Wess-Zumino-Witten model. In terms of the kink momentum vectors, the action is independent of the coupling and the classical theory reduces to a single discrete-time Toda-type theory. The WZW model is a singular point in coupling space where the map into Toda variables degenerates.
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A folded string dual for the Sachdev-Ye-Kitaev model
A folded string with imaginary AdS radius is proposed as a bulk dual of SYK, reproducing the known operator spectrum via a Pöschl-Teller equation with SYK-tuned parameters.