Abstract
We investigate the one-loop entanglement entropy of two short intervals with small cross ratio x on a complex plane in two-dimensional conformal field theory (CFT) using operator product expansion of twist operators. We focus on the one-loop entanglement entropy instead of the general order n Rényi entropy, and this makes the calculation much easier. We consider the contributions of stress tensor to order x 10, contributions of W 3 operator to order x 12, and contributions of W 4 operator to order x 14. The CFT results agree with the ones in gravity.
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Li, Z., Zhang, Jj. On one-loop entanglement entropy of two short intervals from OPE of twist operators. J. High Energ. Phys. 2016, 130 (2016). https://doi.org/10.1007/JHEP05(2016)130
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DOI: https://doi.org/10.1007/JHEP05(2016)130