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arXiv 2102.10722hep-th
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四维非平坦椭圆四重、三形式上同调与强耦合理论

Non-flat elliptic four-folds, three-form cohomology and strongly coupled theories in four dimensions

Paul-Konstantin Oehlmann

摘要:

本文考虑基上亏格为$g$的紧致Riemann曲面上的光滑椭圆Calabi-Yau四重曲面,其纤维不再平坦.这些非扁平纤维的贡献Kaehler模量的四倍,但也增加了$g>0$的三种形式的上同调。在F-/M-理论中,这些扇区被解释为六/五维$\mathcal{N}=(1,0)$超共形物质理论的紧致化。三形式上同调导致额外的手征单线态的比例的维度的五维库仑分支的这些部门。我们构造明确的例子,E-弦论以及更高的秩的情况下。对于E-弦论,我们进一步研究除去那些非平坦纤维的锥状跃迁。首先,我们展示了非扁平纤维如何从曲线变形到基底中的孤立点。这消除了三种形式的手征单线态,并导致物质场之间的非微扰四点耦合,这可以被理解为前E弦的残余。或者,可以通过执行双有理基变化来避免非平坦纤维,类似于6D张量分支。对于紧基,这些跃迁交替所有霍奇数,但保持欧拉数不变。

英文摘要:

In this note we consider smooth elliptic Calabi-Yau four-folds whose fiber ceases to be flat over compact Riemann surfaces of genus $g$ in the base. These non-flat fibers contribute Kaehler moduli to the four-fold but also add to the three-form cohomology for $g>0$. In F-/M-theory these sectors are to be interpreted as compactifications of six/five dimensional $\mathcal{N}=(1,0)$ superconformal matter theories. The three-form cohomology leads to additional chiral singlets proportional to the dimension of five dimensional Coulomb branch of those sectors. We construct explicit examples for E-string theories as well as higher rank cases. For the E-string theories we further investigate conifold transitions that remove those non-flat fibers. First, we show how non-flat fibers can be deformed from curves down to isolated points in the base. This removes the chiral singlet of the three-forms and leads to non-perturbative four-point couplings among matter fields which can be understood as remnants of the former E-string. Alternatively, the non-flat fibers can be avoided by performing birational base changes, analogous to 6D tensor branches. For compact bases these transitions alternate all Hodge numbers but leave the Euler number invariant.

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