Spin j Dirac Operators on the Fuzzy 2-Sphere

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The spin 1/2 Dirac operator and its chirality operator on the fuzzy 2-sphere S²F can be constructed using the Ginsparg-Wilson(GW) algebra [arxiv:hep-th/0511114]. This construction actually exists for any spin j on S²F, and have continuum analogues as well on the commutative sphere S² or on R². This is a remarkable fact and has no known analogue in higher dimensional Minkowski spaces. We study such operators on S²F and the commutative S² and formulate criteria for the existence of the limit from the former to the latter. This singles out certain fuzzy versions of these operators as the preferred Dirac operators. We then study the spin 1 Dirac operator of this preferred type and its chirality on the fuzzy 2-sphere and formulate its instanton sectors and their index theory. The method to generalize this analysis to any spin j is also studied in detail.