WITTEN–VENEZIANO from GREEN–SCHWARZ
نویسنده
چکیده
We consider the U(1) problem within the AdS/CFT framework. We explain how the Witten–Veneziano formula for the η mass is related to a generalized Green–Schwarz mechanism. The closed string mode, that cancels the anomaly of the gauged U(1) axial symmetry, is identified with the η meson. In a particular set-up of D3-branes on a C/(Z3 ⊗ Z3) orbifold singularity, the η ′ meson is a twisted-sector R-R field.
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