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arXiv 0811.3866hep-th
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(杂种优势)Narain T-对偶的拓扑变化

Topology Change from (Heterotic) Narain T-Duality

Jarah Evslin, Ruben Minasian

摘要:

我们考虑在一个非平凡的纤维n-环面丛存在一个拓扑非平凡的NS H通量Narain T-对偶。对偶群的拓扑结构和H通量的相应的II型和杂化弦背景的行动被确定。拓扑变化是专门针对具有非平凡H通量的超对称T^2纤维扭转弦背景的情况。我们证明了它在全空间中以及在环面纤维化的基础上保持整体蝌蚪条件。我们发现,其中一些T-对偶交换了未破缺的U(1)规范对称性的一半场强与物理圆纤维化曲率的反自对偶部分。我们验证了这样的T-对偶确实交换了规范丛与圆丛的超对称条件。

英文摘要:

We consider Narain T-duality on a nontrivially fibered n-torus bundle in the presence of a topologically nontrivial NS H flux. The action of the duality group on the topology and H flux of the corresponding type II and heterotic string backgrounds is determined. The topology change is specialized to the case of supersymmetric T^2-fibered torsional string backgrounds with nontrivial H flux. We prove that it preserves the global tadpole condition in the total space as well as on the base of the torus fibration. We find that some of these T-dualities exchange half of the field strength of an unbroken U(1) gauge symmetry with the anti-selfdual part of the curvature of a physical circle fibration. We verify that such T-dualities indeed exchange the supersymmetry condition for the circle bundle with that of the gauge bundle.

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