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arXiv 1102.1428hep-thmath.AG
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超圆锥形跃迁、镜像对称和弦论

Hyperconifold Transitions, Mirror Symmetry, and String Theory

Rhys Davies

摘要:

多重连通的卡-丘三重性对弦理论家和数学家都特别有意义。最近有人指出,这些空间的一般退化之一(发生在模空间的余维1处)是一个孤立的奇点,它是锥的有限循环商;这些被称为超锥。还证明了如果商群的阶是偶数,则这样的奇异簇具有投射的收缩分解,因此它们是光滑的Calabi-Yau流形。由此产生的拓扑转变被称为超锥转变,并改变基本群以及霍奇数。这里Batyrev的建设Calabi-Yau超曲面复曲面fourfolds是用来证明某些紧凑的例子,包含其余hyperconifolds -Z_3和Z_5的情况下-也有Calabi-Yau决议。研究了产生的跃迁的镜像,发现它们是普通的锥状跃迁。这些是第一个例子锥过渡与镜子,这是更奇异的极端过渡。新的超锥变换也被用来构造少量新的具有小Hodge数和基本群Z_3或Z_5的Calabi-Yau流形。最后,证明了超圆锥体是IIB型弦论的物理可感背景。类似于锥状的情况,非微扰动力学平滑了物理模空间,使得超锥状跃迁对应于完整理论中的非奇异过程。

英文摘要:

Multiply-connected Calabi-Yau threefolds are of particular interest for both string theorists and mathematicians. Recently it was pointed out that one of the generic degenerations of these spaces (occurring at codimension one in moduli space) is an isolated singularity which is a finite cyclic quotient of the conifold; these were called hyperconifolds. It was also shown that if the order of the quotient group is even, such singular varieties have projective crepant resolutions, which are therefore smooth Calabi-Yau manifolds. The resulting topological transitions were called hyperconifold transitions, and change the fundamental group as well as the Hodge numbers. Here Batyrev's construction of Calabi-Yau hypersurfaces in toric fourfolds is used to demonstrate that certain compact examples containing the remaining hyperconifolds - the Z_3 and Z_5 cases - also have Calabi-Yau resolutions. The mirrors of the resulting transitions are studied and it is found, surprisingly, that they are ordinary conifold transitions. These are the first examples of conifold transitions with mirrors which are more exotic extremal transitions. The new hyperconifold transitions are also used to construct a small number of new Calabi-Yau manifolds, with small Hodge numbers and fundamental group Z_3 or Z_5. Finally, it is demonstrated that a hyperconifold is a physically sensible background in Type IIB string theory. In analogy to the conifold case, non-perturbative dynamics smooth the physical moduli space, such that hyperconifold transitions correspond to non-singular processes in the full theory.

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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