Chiral algebras of two-dimensional SYK models

A bstract We study chiral algebras in the $$ \overline{Q} $$ Q ¯ -cohomology of two dimensional SYK models with extended supersymmetry. In a special limit discovered in [1], we are able to construct explicitly a “vertical” single-particle higher-spin algebra that is bilinear in the fundamental fields. This algebra can be regarded as the counterpart, when going away from criticality, of the infrared emergent higher-spin symmetry of the $$ \mathcal{N}=\left(0,2\right) $$ N = 0 2 SYK model. Moreover, a second “horizontal” single-particle higher-spin algebra appears in this limit. Together with the vertical algebra they generate a stringy algebra with a “higher spin square” structure that is believed to appear in the tensionless limit of string theory. On the other hand, we do not find single-particle higher-spin algebra away from the special limit, which is consistent with the result in [1]. Our analysis is carried out for each individual realization of the random couplings and for finite N (and M ), which in particular indicates that the conclusion in [1] is robust to 1 /N corrections.

Abstract licence: CC BY

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