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arXiv 1507.05965hep-th
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关于M-理论的$G_2$紧化中的规范增强和奇异极限

On Gauge Enhancement and Singular Limits in $G_2$ Compactifications of M-theory

James Halverson, David R. Morrison

摘要:

我们研究M-理论的$G_2$紧化的奇异极限的物理性质,这是获得具有非交换规范对称性或无质量带电粒子的紧化所必需的。这比卡-丘紧化更困难,因为没有校准的双循环,这将允许直接控制W玻色子质量作为模量的函数。相反,我们研究规范增强和奇异极限之间的关系,在$G_2$模空间的关联或coassociative子流形收缩到零大小,这涉及到物理的拓扑缺陷,有时给间接控制粒子质量,即使他们不是BPS。我们展示了如何乔伊斯引理关联类的三个周期的任何$U(1)$规范理论在光滑的$G_2$紧化。如果在这个类中存在一个合适的结合子流形,那么在非阿贝尔规范对称性的极限下,它可以被解释为一个规范理论世界体积,并提供与非阿贝尔规范场或物质场相关的奇点的位置。我们确定了一些规范增强方案有关的校准子流形,包括库仑分支和非孤立的conifolds,并研究实现它们的例子。

英文摘要:

We study the physics of singular limits of $G_2$ compactifications of M-theory, which are necessary to obtain a compactification with non-abelian gauge symmetry or massless charged particles. This is more difficult than for Calabi-Yau compactifications, due to the absence of calibrated two-cycles that would have allowed for direct control of W-boson masses as a function of moduli. Instead, we study the relationship between gauge enhancement and singular limits in $G_2$ moduli space where an associative or coassociative submanifold shrinks to zero size; this involves the physics of topological defects and sometimes gives indirect control over particle masses, even though they are not BPS. We show how a lemma of Joyce associates the class of a three-cycle to any $U(1)$ gauge theory in a smooth $G_2$ compactification. If there is an appropriate associative submanifold in this class then in the limit of nonabelian gauge symmetry it may be interpreted as a gauge theory worldvolume and provides the location of the singularities associated with non-abelian gauge or matter fields. We identify a number of gauge enhancement scenarios related to calibrated submanifolds, including Coulomb branches and non-isolated conifolds, and also study examples that realize them.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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