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arXiv 2212.13435gr-qc
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de Sitter流形上Dirac理论的离散对称性

Discrete symmetries of Dirac's theory in the de Sitter manifold

Ion I. Cotaescu, Ion Cotaescu

摘要:

研究了德西特流形上狄拉克场的离散对称性,考虑到这有两个部分可以扮演物理时空的角色,即膨胀和坍缩的宇宙。保留部分的适当离散等距具有物理意义,而改变部分的不适当等距则仅具有数学意义。在膨胀部分的物理坐标系中研究了由适当的等距和电荷共轭产生的离散对称性,证明了所有反转宇宙时间的离散变换都是局域的,依赖于一个局域的boost矩阵。这样,在de Sitter膨胀宇宙中得到了Dirac理论的离散群,表明它是16阶的,其乘法表与狭义相对论中的Dirac理论的乘法表相似。此外,所有的离散德西特等距,包括不适当的,在共形框架中进行研究,以获得一个整体形象的德西特等距,尽管事实上,这些不能收集在一个更大的离散组的物理意义。

英文摘要:

The discrete symmetries of the Dirac field on the de Sitter manifold are studied taking into account that this has two portions that can play the role of physical space-times, namely the expanding and a collapsing universes. The proper discrete isometries which preserve the portion have a physical meaning in contrast to the improper ones which change the portion remaining thus of a mere mathematical interest. The discrete symmetries generated by the proper isometries and charge conjugation are studied in physical frames on the expanding portion shoving that all the discrete transformations reversing the cosmic time are local depending on a local boost matrix. Thus the discrete group of Dirac's theory in the de Sitter expanding universe is obtained showing that this is of the order 16 having a multiplication table similar to that of Dirac's theory in special relativity. Moreover, all the discrete de Sitter isometries, including the improper ones, are studied in conformal frames for obtaining a global image about the de Sitter isometries in spite of the fact that these cannot be gathered in a larger discrete group with physical meaning.

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