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  1. ; ; ; (, Journal of High Energy Physics)
    One of the few cases of AdS/CFT where both sides of the duality are under good control relates tensionlessk= 1 strings on AdS3to a two-dimensional symmetric product CFT. Building on prior observations, we propose an exact duality between string theory on a spacetime which is not asymptotically AdS and a non-conformal field theory. The bulk theory is constructed as a marginal deformation of thek= 1 AdS3string while the spacetime dual is a single trace$$ T\overline{T} $$ T T ¯ -deformed symmetric orbifold theory. As evidence for the duality, we match the one-loop bulk and boundary torus partition functions. This correspondence provides a framework to both learn about quantum gravity beyond AdS and understand how to define physical observables in$$ T\overline{T} $$ T T ¯ -deformed field theories. 
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