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arXiv 0708.3097hep-th
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一圈超弦有效作用量和N=8超引力

One loop superstring effective actions and N=8 supergravity

Filipe Moura

摘要:

在前一篇文章中,我们已经证明了在IIA型有效作用量和杂种有效作用量中,除了通常的贝尔-罗宾逊张量的平方之外,还存在一个新的独立R^4项。它已经表明,这样一个长期不能直接超对称化,但我们表明,耦合到一个标量手征多重态后,这是可能的。在这篇文章中,我们研究的扩展(N=8)的超对称化的这项,没有其他耦合可以采取。我们表明,这种超对称化不能实现在线性化的水平。这是在冲突的理论后得到的环形紧化的第二型超弦是N=8超对称。我们解释了这个结果,面对最近的主张,微扰超引力不能从弦论解耦d>=4,N=8,d=4超引力是在沼泽地。

英文摘要:

In a previous article we have shown the existence of a new independent R^4 term, at one loop, in the type IIA and heterotic effective actions, after reduction to four dimensions, besides the usual square of the Bel-Robinson tensor. It had been shown that such a term could not be directly supersymmetrized, but we showed that was possible after coupling to a scalar chiral multiplet. In this article we study the extended (N=8) supersymmetrization of this term, where no other coupling can be taken. We show that such supersymmetrization cannot be achieved at the linearized level. This is in conflict with the theory one gets after toroidal compactification of type II superstrings being N=8 supersymmetric. We interpret this result in face of the recent claim that perturbative supergravity cannot be decoupled from string theory in d>=4, and N=8, d=4 supergravity is in the swampland.

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