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arXiv 0907.1246hep-th
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Dirac费米子的精确Foldy-Wouthuysen变换的某些性质

Some Aspects of the Exact Foldy-Wouthuysen Transformation for a Dirac Fermion

Bruno Goncalves

摘要:

Foldy-Wouthuysen变换(FWT)用于分离相对论旋量场的不同分量,例如电子和正电子。通常情况下,FWT是微扰的,但在某些情况下,有一个对合算子和转换可以精确地完成。我们考虑了一些方面的一个确切的FWT和表明,即使该理论不承认一个对合算子,可以使用的技术,确切的FWT获得传统的微扰结果。有几个具体案例可以作为例子加以阐述。

英文摘要:

The Foldy-Wouthuysen transformation (FWT) is used to separate distinct components of relativistic spinor field, e.g. electron and positron. Usually, the FWT is perturbative, but in some cases there is an involution operator and the transformation can be done exactly. We consider some aspects of an exact FWT and show that, even if the theory does not admit an involution operator, one can use the technique of exact FWT to obtain the conventional perturbative result. Several particular cases can be elaborated as examples.

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