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arXiv 1109.2579hep-thgr-qc
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利用Weyl几何构造共形不变方程

Constructing conformally invariant equations using Weyl geometry

Sofiane Faci

摘要:

给出了任意四维(伪)黎曼空间中共形不变方程的一种新的构造方法。这种方法使用外尔几何作为工具,并利用自然的共形不变性,我们可以建立在这个几何的框架。事实上,在外尔空间中,利用外尔协变导数和内禀的外尔几何张量,所有共形齐次算子都是共形不变的,它们所确定的方程也是。Weyl空间由两个独立的对象定义:度量张量$g_{μν}$和Weyl向量$W_μ$。一个简单的过程允许我们从外尔空间到黎曼空间,通过将外尔向量作为梯度。在一定条件下,Weylian共形不变方程退化为Riemann共形不变方程.应用该方法构造了共形不变标量场方程,检验了麦克斯韦方程组的共形不变性,恢复了Eastwood-Singer共形规范固定条件.

英文摘要:

A new method for the construction of conformally invariant equations in an arbitrary four dimensional (pseudo-) Riemannian space is presented. This method uses the Weyl geometry as a tool and exploits the natural conformal invariance we can build in the framework of this geometry. Indeed, working in a Weyl space, using the Weyl covariant derivative and the intrinsic Weylian geometrical tensors, all conformally homogeneous operators will be conformally invariant, as will the equations they determine. A Weyl space is defined by two independent objects: the metric tensor $g_{μν}$ and the Weyl vector $W_μ$. A simple procedure allows us to go from a Weyl space into a Riemann space by imposing the Weyl vector to be a gradient. Under some conditions, the Weylian conformally invariant equations reduce to Riemannian conformally invariant equations. This method is applied to construct some conformally invariant scalar field equations, check the conformal invariance of Maxwell equations and recover the Eastwood-Singer conformal gauge fixing condition.

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