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arXiv 0811.1932gr-qc
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Einstein-Cartan理论中引力诱导费米子相互作用的非唯一性

Nonuniqueness of gravity-induced fermion interaction in the Einstein-Cartan theory

Marcin Kazmierczak

摘要:

研究了Einstein-Cartan(EC)引力与物质的最小耦合过程的非唯一性问题。它表明,预测的引力与费米物质的理论可以从根本上改变,如果利用的自由,除了一个发散到平坦的空间物质拉格朗日密度。众所周知的引力诱导的四费米子相互作用显示出意想不到的功能。EC引力的最小耦合的非唯一性问题的解决方案被认为是必要的,以使理论产生明确的预测。特别是,与费米子的EC理论是不可区分的,从通常的广义相对论的有效水平上,如果平坦的空间费米子拉格朗日被适当地选择。因此,解决最小耦合过程的非唯一性问题被认为是必要的,如果EC理论是实验验证。它还可以使基于EC的理论的实验测试成为可能,例如量化引力场的回路方法。最后提出了如何限制甚至消除EC理论中的任意性的一些设想。

英文摘要:

The problem of nonuniqueness of minimal coupling procedure for Einstein--Cartan (EC) gravity with matter is investigated. It is shown that the predictions of the theory of gravity with fermionic matter can radically change if the freedom of addition of a divergence to the flat space matter Lagrangean density is exploited. The well--known gravity induced four--fermion interaction is shown to reveal unexpected features. The solution to the problem of nonuniqueness of minimal coupling of EC gravity is argued to be necessary in order for the theory to produce definite predictions. In particular, the EC theory with fermions is shown to be indistinguishable from usual General Relativity on the effective level, if the flat space fermionic Lagrangean is appropriately chosen. Hence, the solution to the problem of nonuniqueness of minimal coupling procedure is argued to be necessary if EC theory is to be experimentally verifiable. It could also enable experimental tests of theories based on EC, such as loop approach to quantisation of gravitational field. Some ideas of how the arbitrariness incorporated in EC theory could be restricted or even eliminated are presented.

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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