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arXiv 0901.3059hep-th
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杂种优势Z6-II MSSM在爆破中的轨道折叠

Heterotic Z6-II MSSM Orbifolds in Blowup

Stefan Groot Nibbelink, Johannes Held, Fabian Ruehle, Michele Trapletti, Patrick K. S. Vaudrevange

摘要:

杂合轨道褶皱为弦论中的MSSM模型提供了有希望的构造。我们通过检查具有阿贝尔规范通量的T^6/Z6-II轨道的分辨率(远不是唯一的)来研究这种轨道模型与光滑卡-丘紧化的联系。这些规范背景的拓扑特征在于扭曲状态的权重向量;每个固定点或固定线。这些状态的VEV从轨道的角度产生了爆破,并且它们在爆破中重新出现为轴子。我们解释的方法来解决24分辨率依赖的Bianchi身份,并提出了一个明确的解决方案。尽管一个解可能包含MSSM粒子谱,超荷却被证明是反常的:由于迄今为止分析的所有杂化MSSM轨道都有不动点,只有SM带电态出现,它的规范群只能在这些奇点不被炸毁的情况下才能被保留。超越纯粹拓扑量(例如反常U(1)质量)的比较可能会受到以下事实的阻碍:在轨道极限中,超引力近似到α素数的最低阶是崩溃的。

英文摘要:

Heterotic orbifolds provide promising constructions of MSSM-like models in string theory. We investigate the connection of such orbifold models with smooth Calabi-Yau compactifications by examining resolutions of the T^6/Z6-II orbifold (which are far from unique) with Abelian gauge fluxes. These gauge backgrounds are topologically characterized by weight vectors of twisted states; one per fixed point or fixed line. The VEV's of these states generate the blowup from the orbifold perspective, and they reappear as axions on the blowup. We explain methods to solve the 24 resolution dependent Bianchi identities and present an explicit solution. Despite that a solution may contain the MSSM particle spectrum, the hypercharge turns out to be anomalous: Since all heterotic MSSM orbifolds analyzed so far have fixed points where only SM charged states appear, its gauge group can only be preserved provided that those singularities are not blown up. Going beyond the comparison of purely topological quantities (e.g. anomalous U(1) masses) may be hampered by the fact that in the orbifold limit the supergravity approximation to lowest order in alpha prime is breaking down.

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