The automorphic NS5-brane
arXiv:0902.3274
Abstract
Understanding the implications of SL(2,Z) S-duality for the hypermultiplet moduli space of type II string theories has led to much progress recently in uncovering D-instanton contributions. In this work, we suggest that the extended duality group SL(3,Z), which includes both S-duality and Ehlers symmetry, may determine the contributions of D5 and NS5-branes. We support this claim by automorphizing the perturbative corrections to the "extended universal hypermultiplet", a five-dimensional universal SL(3,R)/SO(3) subspace which includes the string coupling, overall volume, Ramond zero-form and six-form and NS axion. Using the non-Abelian Fourier expansion of the Eisenstein series attached to the principal series of SL(3,R), first worked out by Vinogradov and Takhtajan 30 years ago, we extract the contributions of D(-1)-D5 and NS5-brane instantons, corresponding to the Abelian and non-Abelian coefficients, respectively. In particular, the contributions of k NS5-branes can be summarized into a vector of wave functions Ψ_{k,l}, l=0... k-1, as expected on general grounds. We also point out that for more general models with a symmetric moduli space G/K, the minimal theta series of G generates an infinite series of exponential corrections of the form required for "small" D(-1)-D1-D3-D5-NS5 instanton bound states. As a mathematical spin-off, we make contact with earlier results in the literature about the spherical vectors for the principal series of SL(3,R) and for minimal representations.
51 pages; v3: misprints corrected, clarifications and references added, final version to appear in CNTP; v4: Eq. 3.12, 3.16, 3.72 corrected, ref. [38] added, other minor corrections
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- On quantum corrected Kähler potentials in F-theory
- Fourier expansions of Kac-Moody Eisenstein series and degenerate Whittaker vectors