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arXiv 0810.2267hep-th
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Gepner模型的非超对称定向折叠

Non-supersymmetric Orientifolds of Gepner Models

B. Gato-Rivera, A. N. Schellekens

摘要:

从以前收集的一组无快子闭弦,我们寻找N=2极小模型orientifold光谱包含标准模型,是免费的快子和蝌蚪在最低阶。对于每一类无快子的闭弦--体超对称、自同构不变量或克莱因瓶投影--我们确实发现了包含标准模型的非超对称和无快子的手征膜配置。然而,一个消除蝌蚪的隐藏扇区只能在体超对称的情况下被发现。虽然我们发现的例子中有一半是利用了打破体时空超对称性的膜,但由此产生的无质量开弦谱在所有情况下都是超对称的。下降的要求,标准模型包含在光谱中,我们发现手征快子和蝌蚪免费的解决方案在所有三种情况下,虽然在批量超对称的情况下,所有的无质量光谱是超对称的。在其他两种情况下,我们发现真正的非超对称光谱,但其中很大一部分仍然是部分或完全超对称的无质量水平。

英文摘要:

Starting from a previously collected set of tachyon-free closed strings, we search for N=2 minimal model orientifold spectra which contain the standard model and are free of tachyons and tadpoles at lowest order. For each class of tachyon-free closed strings -- bulk supersymmetry, automorphism invariants or Klein bottle projection -- we do indeed find non-supersymmetric and tachyon free chiral brane configurations that contain the standard model. However, a tadpole-cancelling hidden sector could only be found in the case of bulk supersymmetry. Although about half of the examples we have found make use of branes that break the bulk space-time supersymmetry, the resulting massless open string spectra are nevertheless supersymmetric in all cases. Dropping the requirement that the standard model be contained in the spectrum, we find chiral tachyon and tadpole-free solutions in all three cases, although in the case of bulk supersymmetry all massless spectra are supersymmetric. In the other two cases we find truly non-supersymmetric spectra, but a large fraction of them are nevertheless partly or fully supersymmetric at the massless level.

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