Automorphic symmetries and $ AdS_n $ integrable deformations

Abstract

We develop the method based on $ \mathcal{B} $-automorphism for finding new lattice integrable models with various dimensions of local Hilbert spaces. We initiate the technique by implementing it to the two-dimensional models and resolve classification problem, which not only confirms known vertex model solution space, but also extends to the new $ \mathfrak{sl}_{2} $ deformed sector. The generalisation of the approach for string integrable models is provided and allows to find new integrable deformations and associated $ R $-matrices. Hence novel integrable solutions appear to be of non-difference form that admit $ AdS_2 $ and $ AdS_3 $ $ S $-matrices as special cases, we also obtain embedding of double deformed sigma model $ R $-matrix into one of the solutions. The braiding and crossing for the found models as well as their emergence with respect to the deformation parameter $ k $ are shown.