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arXiv 1207.2176hep-thmath-phmath.MP
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非阿贝尔情形下矢势Dirac方程的代数反演

Algebraic inversion of the Dirac equation for the vector potential in the non-abelian case

S. M. Inglis, P. D. Jarvis

摘要:

我们研究了旋量波函数的狄拉克方程最低限度地耦合到一个外部领域,从一个代数系统的线性方程组的矢量势的角度来看。通过类比电磁学中的方法,我们建立了非阿贝尔规范对称性的形式,并在SU(2)群和四旋量偶态的情况下得到了麦克斯韦-狄拉克方程的经典解.一个扩展的同位旋电荷共轭算子的定义,使厄米性约束的规范势施加在一个协变的方式,并呈现易于处理的代数系统。其结果是一个可逆的线性方程的非阿贝尔矢量位的bispinor电流密度。我们表明,通过应用适当的扩展Fierz恒等式,该系统的非阿贝尔矢量势的解决方案是一个合理的表达,只涉及泡利标量和泡利三重态,洛伦兹标量,矢量和轴向矢量电流密度,虽然在非封闭形式的诺依曼级数。

英文摘要:

We study the Dirac equation for spinor wavefunctions minimally coupled to an external field, from the perspective of an algebraic system of linear equations for the vector potential. By analogy with the method in electromagnetism, which has been well-studied, and leads to classical solutions of the Maxwell-Dirac equations, we set up the formalism for non-abelian gauge symmetry, with the SU(2) group and the case of four-spinor doublets. An extended isospin-charge conjugation operator is defined, enabling the hermiticity constraint on the gauge potential to be imposed in a covariant fashion, and rendering the algebraic system tractable. The outcome is an invertible linear equation for the non-abelian vector potential in terms of bispinor current densities. We show that, via application of suitable extended Fierz identities, the solution of this system for the non-abelian vector potential is a rational expression involving only Pauli scalar and Pauli triplet, Lorentz scalar, vector and axial vector current densities, albeit in the non-closed form of a Neumann series.

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