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arXiv 2201.04634hep-thmath.AG
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弦理论中的D(-1)瞬子超势

D(-1)-Instanton Superpotential In String Theory

Manki Kim

AI总结:

本文通过引入全局Sen极限下的F理论紧化,证明了底层IIB型紧化的超势在全局Sen极限下不接受D(-1)瞬子贡献,且该结果在$g_s$上是精确的。

摘要:

我们研究了在Calabi-Yau三重超曲面的定向平流形上进行IIB型紧化时,由D(-1)膜产生的非微扰超势。为了计算D瞬子超势,我们研究了在环面完全交集椭圆Calabi-Yau四重流形上的F理论紧化。我们在F理论紧化中取Sen极限,但保持有限的$g_s$,并限制所有D7膜都带有SO(8)规范群,我们称之为全局Sen极限。在全局Sen极限下,轴子-伸缩子在紧化流形上不发生变化。我们计算了全局Sen极限下椭圆Calabi-Yau四重流形的Picard-Fuchs方程,并表明椭圆四重流形的Picard-Fuchs方程分裂为底层Calabi-Yau三重流形和椭圆纤维的方程。然后我们证明,Picard-Fuchs方程的这一分裂性质意味着全局Sen极限下椭圆Calabi-Yau四重流形的四形式周期不包含指数抑制项$\mathcal{O}(e^{-π/g_s})$。利用这一结果,我们最终证明,在全局Sen极限下,底层IIB型紧化的超势不接受D(-1)瞬子贡献。该结果在$g_s$上是精确的。

英文摘要:

We study the non-perturbative superpotential generated by D(-1)-branes in type IIB compactifications on orientifolds of Calabi-Yau threefold hypersurfaces. To compute the D-instanton superpotential, we study F-theory compactification on toric complete intersection elliptic Calabi-Yau fourfolds. We take the Sen-limit, but with finite $g_s,$ in F-theory compactification with a restriction that all D7-branes are carrying SO(8) gauge groups, which we call the global Sen-limit. In the global Sen-limit, the axio-dilaton is not varying in the compactification manifold. We compute the Picard-Fuchs equations of elliptic Calabi-Yau fourfolds in the global Sen-limit, and show that the Picard-Fuchs equations of the elliptic fourfolds split into that of the underlying Calabi-Yau threefolds and of the elliptic fiber. We then demonstrate that this splitting property of the Picard-Fuchs equation implies that the fourform period of the elliptic Calabi-Yau fourfolds in the global Sen-limit does not contain exponentially suppressed terms $\mathcal{O}(e^{-π/g_s})$. With this result, we finally show that in the global Sen-limit, the superpotential of the underlying type IIB compactification does not receive D(-1)-instanton contributions. This result is exact in $g_s.$

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