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arXiv 0902.2761hep-th
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D-瞬子和扭子:一些精确结果

D-instantons and twistors: some exact results

Sergei Alexandrov

摘要:

给出了II型弦论的Calabi-Yau紧化中超多重态模空间的瞬子修正的一些结果。以前,使用扭量方法,只有一类D-瞬子(D2-瞬子包裹A-圈)被精确地纳入,其余的只被线性处理。我们超越了线性近似,并给出了一组全纯函数,通过一个已知的程序,捕捉D-瞬子的效果在所有订单。此外,我们表明,对于一个部门,所有的瞬子费用有消失的辛不变标积,超多重态度量可以明确计算。

英文摘要:

We present some results on instanton corrections to the hypermultiplet moduli space in Calabi-Yau compactifications of Type II string theories. Previously, using twistor methods, only a class of D-instantons (D2-instantons wrapping A-cycles) was incorporated exactly and the rest was treated only linearly. We go beyond the linear approximation and give a set of holomorphic functions which, through a known procedure, capture the effect of D-instantons at all orders. Moreover, we show that for a sector where all instanton charges have vanishing symplectic invariant scalar product, the hypermultiplet metric can be computed explicitly.

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