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Geometric Dirac operator on the fuzzy sphere

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We construct a Connes spectral triple or ‘Dirac operator’ on the non-reduced fuzzy sphere $$\mathbb {C}_\lambda [S^2]$$ C λ [ S 2 ] as realised using quantum Riemannian geometry with… Click to show full abstract

We construct a Connes spectral triple or ‘Dirac operator’ on the non-reduced fuzzy sphere $$\mathbb {C}_\lambda [S^2]$$ C λ [ S 2 ] as realised using quantum Riemannian geometry with a central quantum metric g of Euclidean signature and its associated quantum Levi-Civita connection. The Dirac operator is characterised uniquely up to unitary equivalence within our quantum Riemannian geometric setting and an assumption that the spinor bundle is trivial and rank 2 with a central basis. The spectral triple has KO dimension 3 and in the case of the round metric, essentially, recovers a previous proposal motivated by rotational symmetry.

Keywords: dirac operator; fuzzy sphere; operator fuzzy; dirac; geometric dirac

Journal Title: Letters in Mathematical Physics
Year Published: 2022

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