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arXiv 0807.1382physics.class-ph
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无张量电磁能量-动量方程的几何代数方法

Electromagnetic energy-momentum equation without tensors: a geometric algebra approach

Quirino M. Sugon, Daniel J. McNamara

摘要:

本文将能量动量密度定义为复矢量电磁场与其复共轭场的乘积。我们导出了能量动量密度的时空导数方程。我们证明了该方程的标量和矢量部分是能量和动量的微分守恒律,虚矢量部分是坡印廷矢量旋度的关系。我们可以证明这个能量-动量方程的时空导数是一个波动方程。我们的形式是Clifford(Geometric)代数Cl_{4,0}框架下的Dirac-Pauli-Hestenes代数。

英文摘要:

In this paper, we define energy-momentum density as a product of the complex vector electromagnetic field and its complex conjugate. We derive an equation for the spacetime derivative of the energy-momentum density. We show that the scalar and vector parts of this equation are the differential conservation laws for energy and momentum, and the imaginary vector part is a relation for the curl of the Poynting vector. We can show that the spacetime derivative of this energy-momentum equation is a wave equation. Our formalism is Dirac-Pauli-Hestenes algebra in the framework of Clifford (Geometric) algebra Cl_{4,0}.

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