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arXiv 0709.2540hep-thgr-qc
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四维引力的显协变正则量子化与超态反常

Manifestly covariant canonical quantization of gravity and diffeomorphism anomalies in four dimensions

T. A. Larsson

摘要:

引力的正则量子化需要关于其约束代数的表示理论的知识,这在物理上等价于任意4-同态的代数。所有有趣的最低能量表示都是投射的,使得相关的代数成为维拉索罗代数的四维推广。这种自同构反常在场论中是看不见的,因为相关的上循环是观测者在时空中的轨迹的泛函。多维维拉索罗代数自然地作用于任意历史的相空间中,动力学起着第一类约束的作用。广义相对论是通过围绕观察者的轨迹展开泰勒级数中的所有场,并在某个固定阶上截断来正则化的。这种正则化但明显的广义协变理论在历史相空间中被量子化,然后施加动力学,类似于BRST量子化。当正则化被移除时,无穷大就出现了;目前还不清楚应该如何处理这些问题。

英文摘要:

Canonical quantization of gravity requires knowledge about the representation theory of its constraint algebra, which is physically equivalent to the algebra of arbitrary 4-diffeomorphisms. All interesting lowest-energy representations are projective, making the relevant algebra into a four-dimensional generalization of the Virasoro algebra. Such diffeomorphism anomalies are invisible in field theory, because the relevant cocycles are functionals of the observer's trajectory in spacetime. The multi-dimensional Virasoro algebra acts naturally in the phase space of arbitrary histories, with dynamics playing the role of first-class constraints. General relativity is regularized by expanding all fields in Taylor series around the observer's trajectory, and truncating at some fixed order. This regularized but manifestly general-covariant theory is quantized in the history phase space, and dynamics is imposed afterwards, in analogy with BRST quantization. Infinities arise when the regularization is removed; it is presently unclear how these should be dealt with.

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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