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arXiv 0909.4299hep-thmath.NT
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SU(2,1)上泛超多重态和自守形式的瞬子修正

Instanton Corrections to the Universal Hypermultiplet and Automorphic Forms on SU(2,1)

Ling Bao, Axel Kleinschmidt, Bengt E. W. Nilsson, Daniel Persson, Boris Pioline

摘要:

IIA型弦论中紧化在刚性卡-丘三重X上的超多重态模空间(对应于“泛超多重态”)在树水平上由对称空间SU(2,1)/(SU(2)× U(1))描述.为了确定这个度规的量子修正,我们假设连续树级等距群SU(2,1)的离散子群,即Picard模群SU(2,1;Z[i]),必须在精确度规中保持不间断-包括所有微扰和非微扰量子修正。当X允许与Z[i]的复数乘法时,该假设预期是有效的。基于这一假设,我们构造了一个SU(2,1;Z[i])不变的非全纯Eisenstein级数,并初步提出该Eisenstein级数提供了泛超多重态模空间上扭量空间的精确接触势.我们分析了它的非阿贝尔傅立叶展开,并表明阿贝尔和非阿贝尔傅立叶系数采取所需的形式,由于欧氏D2-膜包装特殊的拉格朗日子流形的瞬子校正,和欧氏NS 5-膜包装整个卡-丘三倍,分别。虽然这个尝试性的提议未能重现正确的单圈修正,但傅立叶展开与物理预期的一致性为Picard模群在约束量子模空间中的效用提供了强有力的支持。

英文摘要:

The hypermultiplet moduli space in Type IIA string theory compactified on a rigid Calabi-Yau threefold X, corresponding to the "universal hypermultiplet", is described at tree-level by the symmetric space SU(2,1)/(SU(2) x U(1)). To determine the quantum corrections to this metric, we posit that a discrete subgroup of the continuous tree-level isometry group SU(2,1), namely the Picard modular group SU(2,1;Z[i]), must remain unbroken in the exact metric -- including all perturbative and non perturbative quantum corrections. This assumption is expected to be valid when X admits complex multiplication by Z[i]. Based on this hypothesis, we construct an SU(2,1;Z[i])-invariant, non-holomorphic Eisenstein series, and tentatively propose that this Eisenstein series provides the exact contact potential on the twistor space over the universal hypermultiplet moduli space. We analyze its non-Abelian Fourier expansion, and show that the Abelian and non-Abelian Fourier coefficients take the required form for instanton corrections due to Euclidean D2-branes wrapping special Lagrangian submanifolds, and to Euclidean NS5-branes wrapping the entire Calabi-Yau threefold, respectively. While this tentative proposal fails to reproduce the correct one-loop correction, the consistency of the Fourier expansion with physics expectations provides strong support for the utility of the Picard modular group in constraining the quantum moduli space.

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