Abstract
Recent work by Zamolodchikov and others has uncovered a solvable irrelevant deformation of general 2D CFTs, defined by turning on the dimension 4 operator \( T\overline{T} \),the product of the left- and right-moving stress tensor. We propose that in the holographic dual, this deformation represents a geometric cutoff that removes the asymptotic region of AdS and places the QFT on a Dirichlet wall at finite radial distance r = rc in the bulk. As a quantitative check of the proposed duality, we compute the signal propagation speed, energy spectrum, and thermodynamic relations on both sides. In all cases, we obtain a precise match. We derive an exact RG flow equation for the metric dependence of the effective action of the \( T\overline{T} \) deformed theory, and find that it coincides with the Hamilton-Jacobi equation that governs the radial evolution of the classical gravity action in AdS.
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ArXiv ePrint: 1611.03470
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McGough, L., Mezei, M. & Verlinde, H. Moving the CFT into the bulk with \( T\overline{T} \). J. High Energ. Phys. 2018, 10 (2018). https://doi.org/10.1007/JHEP04(2018)010
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DOI: https://doi.org/10.1007/JHEP04(2018)010