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- W4311186688 abstract "In this paper we study the properties of two-dimensional CFTs defined by cyclic and symmetric orbifolds of free Dirac fermions, especially by focusing on the partition function and entanglement entropy. Via the bosonization, we construct the twist operators which glue two complex planes to calculate the partition function of Z_2 orbifold CFT on a torus. We also find an expression of Z_N cyclic orbifold in terms of Hecke operators, which provides an explicit relation between the partition functions of cyclic orbifolds and those of symmetric ones. We compute the entanglement entropy and Renyi entropy in cyclic orbifolds on a circle both for finite temperature states and for time-dependent states under quantum quenches. We find that the replica method calculation is highly non-trivial and new because of the contributions from replicas with different boundary conditions. We find the full expression for the Z_2 orbifold and show that the periodicity gets doubled. Finally, we discuss extensions of our results on entanglement entropy to symmetric orbifold CFTs and make a heuristic argument towards holographic CFTs." @default.
- W4311186688 created "2022-12-24" @default.
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- W4311186688 date "2022-12-01" @default.
- W4311186688 modified "2023-10-14" @default.
- W4311186688 title "Free fermion cyclic/symmetric orbifold CFTs and entanglement entropy" @default.
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- W4311186688 doi "https://doi.org/10.1007/jhep12(2022)004" @default.
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