由psl(2|2)^(2)k非线性σ-模型加上WZ-项得到的WZW模型足共形场论,它具有李超代数psl(2|2)对称性.该文用向量相干态方法给出了李超代数psl(2|2)的微分算子表示.并在此基础上给出了扭曲Kac-Moody李超代数psl(2|2)^(2)k自由场实现,相应共形场论的中心荷为-2.
The twisted Kac-Moody Lie superalgebra psl(2|2)^(2)k is investigated by means of the vector coherent state method and obtained the differential operators realization. The authors get the free field representation of psl(2|2)^(2)k, which is the subalgebra of gl(2|2)^(2)k modulo the Z4-outer automorphism, the CFT has central charge -2.