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arXiv 0711.2389hep-th
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复标量场下QED对称不变性的超场方法

Superfield approach to symmetry invariance in QED with complex scalar fields

R. P. Malik, B. P. Mandal

摘要:

我们证明了超拉格朗日密度的Grassmannian独立性,用定义在(4,2)维超流形上的超场表示,是描述U(1)相互作用的相应四维(3 + 1)拉格朗日密度的Becchi-Rouet-Stora-Tyrant(BRST)和反BRST不变性的一个明确的证明。规范场和荷电复标量场。在(4,2)维超流形上考虑了上述四维场论模型,该超流形由四个普通时空变量x^μ(μ= 0,1,2,3)和一对格拉斯曼变量θ和\bar θ(θ^2 = \bar θ^2 = 0,θ \bar θ+ \bar θθ= 0)参数化.在几何上,(反)BRST不变性被编码在沿着上述超流形的格拉斯曼方向的超拉格朗日密度的平移中,使得该移位操作的结果为零。

英文摘要:

We show that the Grassmannian independence of the super Lagrangian density, expressed in terms of the superfields defined on a (4, 2)-dimensional supermanifold, is a clear-cut proof for the Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST invariance of the corresoponding four (3 + 1)-dimensional (4D) Lagrangian density that describes the interaction between the U(1) gauge field and the charged complex scalar fields. The above 4D field theoretical model is considered on a (4, 2)-dimensional supermanifold parametrized by the ordinary four spacetime variables x^μ(with μ= 0, 1, 2, 3) and a pair of Grassmannian variables θand \barθ(with θ^2 = \barθ^2 = 0, θ\barθ+ \barθθ= 0). Geometrically, the (anti-)BRST invariance is encoded in the translation of the super Lagrangian density along the Grassmannian directions of the above supermanifold such that the outcome of this shift operation is zero.

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