Superstrings in type IIB R-R plane-wave in semi-light-cone gauge and conformal invariance

作者：Mukhopadhyay Partha^*

来源：Journal of High Energy Physics, 2009, 2009(5): 059.

DOI：10.1088/1126-6708/2009/05/059

• Penrose limit and pp-wave background
• Conformal Field Models in String Theory
• Anomalies in Field and String Theories
• Sigma Models

We reconsider the analysis done by Kazama and Yokoi in arXiv:0801.1561 (hep-th). We find that although the right vacuum of the theory is the one associated to massless normal ordering (MNO), phase space normal ordering (PNO) plays crucial role in the analysis in the following way. While defining the quantum energy-momentum (EM) tensor one needs to take into account the field redefinition relating the space-time field and the corresponding world-sheet coupling. We argue that for a simple off-shell ansatz for the background this field redefinition can be taken to be identity if the interaction term is ordered according to PNO. This definition reproduces the correct physical spectrum when the background is on-shell. We further show that the right way to extract the effective equation of motion from the Virasoro anomaly is to first order the anomaly terms according to PNO at a finite regularization parameter epsilon and then take the epsilon -> 0 limit. This prescription fixes an ambiguity in taking the limit for certain bosonic and fermionic contributions to the Virasoro anomaly and is the natural one to consider given the above definition of the EM tensor.

• 出版日期2009-5
• 单位常州工学院