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AbstractAbstract
[en] It is shown that the local axial anomaly in 2-dimensions emerges naturally if one postulates an underlying noncommutative fuzzy structure of spacetime. In particular the Dirac-Ginsparg-Wilson relation on S2F is shown to contain an edge effect which corresponds precisely to the 'fuzzy' U(1)A axial anomaly on the fuzzy sphere. We also derive a novel gauge-covariant expansion of the quark propagator in the form (1/DAF) (aΓ-circumflexL)/2+1/(DAa) where a = 2/(2l+1) is the lattice spacing on S2F, Γ-circumflexL is the covariant noncommutative chirality and DAa is an effective Dirac operator which has essentially the same IR spectrum as DAF but differs from it on the UV modes. Most remarkably is the fact that both operators share the same limit and thus the above covariant expansion is not available in the continuum theory. The first bit in this expansion (aΓ-circumflexL)/2 although it vanishes as it stands in the continuum limit, its contribution to the anomaly is exactly the canonical theta term. The contribution of the propagator 1/(DAa) is on the other hand equal to the topological Chern-Simons action which in two dimensions vanishes identically. (author)
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Available online at the Web site for the Journal of High Energy Physics (ISSN 1029-8479) http://www.iop.org/; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of High Energy Physics; ISSN 1126-6708;
; v. 08(2003); p. vp

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