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Entanglement of Local Operators in large N CFTs

We study Renyi and von-Neumann entanglement entropy of excited states created by local operators in large N (or large central charge) CFTs. First we point that a naive large N expansion can break down for the von-Neumann entanglement entropy, while it does not for the Renyi entanglement entropy. This happens even for the excited states in free Yang-Mills theories. Next, we analyze strongly coupled large N CFTs from both field theoretic and holographic viewpoints. We find that the Renyi entanglement entropy of the excited state produced by a local operator, grows logarithmically under its time evolution and its coefficient is proportional to the conformal dimension of the local operator.

preprint2014arXivOpen access
Pawel CaputaMasahiro NozakiTadashi Takayanagi
cond-mat.str-elhep-thquant-ph
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Pawel CaputaMasahiro NozakiTadashi Takayanagi

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