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arXiv 1202.6045gr-qchep-th
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Diakonov推广的Einstein-Cartan理论:场方程

Extended Einstein-Cartan theory a la Diakonov: the field equations

Yuri N. Obukhov, Friedrich W. Hehl

摘要:

Diakonov在庞加莱规范理论(PGT)的几何框架内建立了一个原初狄拉克旋量场的引力相互作用模型。因此,引力场变量是标准正交余标架和洛伦兹联络。一个简单的引力规范拉格朗日量是爱因斯坦-嘉当的选择,正比于曲率标量加上一个宇宙学项。在Diakonov的模型中,通过用原始旋量来表示余框架,从而消除了余框架。首次导出了相应的场方程。我们通过额外消除洛伦兹连接来扩展Diakonov模型,但保持局部洛伦兹协方差不变。然后,如果我们在拉格朗日量中去掉Einstein-Cartan项,则在最低近似下恢复为非线性Heisenberg型旋量方程。

英文摘要:

Diakonov formulated a model of a primordial Dirac spinor field interacting gravitationally within the geometric framework of the Poincaré gauge theory (PGT). Thus, the gravitational field variables are the orthonormal coframe (tetrad) and the Lorentz connection. A simple gravitational gauge Lagrangian is the Einstein-Cartan choice proportional to the curvature scalar plus a cosmological term. In Diakonov's model the coframe is eliminated by expressing it in terms of the primordial spinor. We derive the corresponding field equations for the first time. We extend the Diakonov model by additionally eliminating the Lorentz connection, but keeping local Lorentz covariance intact. Then, if we drop the Einstein-Cartan term in the Lagrangian, a nonlinear Heisenberg type spinor equation is recovered in the lowest approximation.

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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