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arXiv 0807.2276hep-th
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N= 1,2 SUSY西格玛模型的模式正则化

Mode Regularization for N=1,2 SUSY Sigma Model

Roberto Bonezzi, Marco Falconi

摘要:

弯曲背景下的世界线N=1和N=2超对称西格玛模型分别适用于描述自旋为1/2和自旋为1的粒子。众所周知,弯曲空间中的世界线路径积分需要正则化:我们在这里提出了这些模型的模式正则化,特别是在平坦和弯曲的世界线费米子指数的情况下,找到相应的反项。当N=1时,我们发现费米子对反项的贡献抵消了玻色子的贡献,导致总反项消失,从而保持了经典作用量的协方差和超对称性。相反,在N=2的超对称的情况下,我们得到一个非协变的反项与弯曲和平坦的指数。本文完成了对一维N= 1,2非线性西格玛模型的正则化格式的分析。

英文摘要:

Worldline N=1 and N=2 supersymmetric sigma models in curved background are useful to describe spin one-half and spin one particles coupled to external gravity, respectively. It is well known that worldline path integrals in curved space require regularization: we present here the mode-regularization for these models, finding in particular the corresponding counterterms, both in the case of flat and curved indices for worldline fermions. For N=1, using curved indices we find a contribution to the counterterm from the fermions that cancels the contribution of the bosons, leading to a vanishing total counterterm and thus preserving the covariance and supersymmetry of the classical action. Conversely in the case of N=2 supersymmetries we obtain a non-covariant counterterm with both curved and flat indices. This work completes the analysis of the known regularization schemes for N=1,2 nonlinear sigma models in one dimension.

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