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Topological Strings and (Almost) Modular Forms

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arxiv hep-th/0607100 v2 pith:OVY5F7C4 submitted 2006-07-17 hep-th math.AGmath.NT

classification hep-thmath.AGmath.NT
keywords topologicalstringgenusholomorphicmodularalmostamplitudescalabi-yau
verification ladder T0 review T1 audit T2 compute T3 formal
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The B-model topological string theory on a Calabi-Yau threefold X has a symmetry group Gamma, generated by monodromies of the periods of X. This acts on the topological string wave function in a natural way, governed by the quantum mechanics of the phase space H^3(X). We show that, depending on the choice of polarization, the genus g topological string amplitude is either a holomorphic quasi-modular form or an almost holomorphic modular form of weight 0 under Gamma. Moreover, at each genus, certain combinations of genus g amplitudes are both modular and holomorphic. We illustrate this for the local Calabi-Yau manifolds giving rise to Seiberg-Witten gauge theories in four dimensions and local P_2 and P_1 x P_1. As a byproduct, we also obtain a simple way of relating the topological string amplitudes near different points in the moduli space, which we use to give predictions for Gromov-Witten invariants of the orbifold C^3/Z_3.

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Cited by 3 Pith papers

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