（无方向）T形折叠，T形较少
(Unoriented) T-folds with few T's
摘要：
我们利用Z_2-手征反射（T-对偶）和位移的联合作用，构造了N= 1，2的具有少量模的超对称四维弦紧化。特别地，我们考虑SO（12）的极大环面上的IIB型Z_2^4非对称轨道折叠，它模拟了N=2的Calabi-Yau紧化，具有从（h_{11}，h_{21}）=（1，1）开始的小“有效”Hodge数。我们分析可能的无方向的预测，提供I型的例子，或不开字符串。N=1取向的不对称移位轨道的IIB型与几个手征多重峰也被提出。
英文摘要：
We use the combined action of Z_2-chiral reflections (T-dualities) and shifts to build N=1,2 supersymmetric four-dimensional string compactifications with few moduli. In particular, we consider Z_2^4 asymmetric orbifolds of Type IIB on the maximal torus of SO(12) that mimic N=2 Calabi-Yau compactifications with small "effective" Hodge numbers starting from (h_{11}, h_{21})=(1,1). We analyze possible unoriented projections, providing Type I examples with or without open strings. N=1 oriented asymmetric shift-orbifolds of Type IIB with few chiral multiplets are also presented.
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