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- W1977928007 abstract "We present some exact results about universal quantities derived from the local density matrix, for a free massive Dirac field in two dimensions. We first find the trace of powers of the density matrix in a novel fashion, which involves the correlators of suitable operators in the sine-Gordon model. These, in turn, can be written exactly in terms of the solutions of non-linear differential equations of the Painlev'e V type. Equipped with the previous results, we find the leading terms for the entanglement entropy, both for short and long distances, and showing that in the intermediate regime it can be expanded in a series of multiple integrals. The previous results have been checked by direct numerical calculations on the lattice, finding perfect agreement. Finally, we comment on a possible generalization of the entanglement entropy c-theorem to the alpha-entropies." @default.
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- W1977928007 date "2005-07-27" @default.
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- W1977928007 title "Entanglement and alpha entropies for a massive Dirac field in two dimensions" @default.
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- W1977928007 doi "https://doi.org/10.1088/1742-5468/2005/07/p07007" @default.
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