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arXiv 0705.0351gr-qcmath-phmath.MP
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引力和电磁学的统一的纯仿射理论

A unified, purely affine theory of gravitation and electromagnetism

Nikodem J. Poplawski

摘要:

在引力的纯仿射表述中,引力场由仿射联络的里奇张量的对称部分表示。经典电磁场可以在这个公式中表示为第二个里奇张量的联系。这样的构造在动力学上等价于无源的Einstein-麦克斯韦方程组。我们推广这种建设的情况下,与源,表示的仿射拉格朗日密度的导数相对于连接。我们表明,麦克斯韦方程组的源出现的最简单的仿射拉格朗日物质,而爱因斯坦和洛伦兹方程出现,如果质量有电磁起源。我们还表明,麦克斯韦方程组取代纯粹的仿射拉格朗日的投影不变性,明确依赖于连接的非物理约束。

英文摘要:

In the purely affine formulation of gravity, the gravitational field is represented by the symmetric part of the Ricci tensor of the affine connection. The classical electromagnetic field can be represented in this formulation by the second Ricci tensor of the connection. Such a construction is dynamically equivalent to the sourceless Einstein-Maxwell equations. We generalize this construction to the case with sources, represented by the derivative of the affine Lagrangian density with respect to the connection. We show that the Maxwell equations with sources emerge for the simplest affine Lagrangian for matter, while the Einstein and Lorentz equations arise if mass has electromagnetic origin. We also show that the Maxwell equations replace the unphysical constraint imposed by the projective invariance of purely affine Lagrangians that depend explicitly on the connection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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