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- W2904667199 abstract "Ghost-spins, 2-level spin-like variables with indefinite norm have been studied in previous work. Here we explore various $N$-level generalizations of ghost-spins. First we discuss a flavoured generalization comprising $N$ copies of the ghost-spin system, as well as certain ghost-spin chains which in the continuum limit lead to 2-dim $bc$-ghost CFTs with $O(N)$ flavour symmetry. Then we explore a symplectic generalization that involves antisymmetric inner products, and finally a ghost-spin system exhibiting $N$ irreducible levels. We also study entanglement properties. In all these cases, we show the existence of positive norm correlated ghost-spin states in two copies of ghost-spin ensembles obtained by entangling identical ghost-spins from each copy: these exhibit positive entanglement entropy." @default.
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- W2904667199 date "2019-05-07" @default.
- W2904667199 modified "2023-09-25" @default.
- W2904667199 title "N -level ghost spins and entanglement" @default.
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- W2904667199 doi "https://doi.org/10.1103/physrevd.99.106003" @default.
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