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arXiv 2004.07842hep-thastro-ph.COgr-qchep-ph
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引力的幺正的、可重整化的和紫外完备的量子理论

Towards a unitary, renormalizable and ultraviolet-complete quantum theory of gravity

Christian F. Steinwachs

摘要:

对于任何基本的量子场论,么正性、重整化性和相对论不变性被认为是基本的性质。幺正性不可避免地与量子理论的概率解释相联系,而重整化性保证了它的完备性。相对论不变性,反过来,是一种对称性,它源于时空的结构。到目前为止,微扰的尝试,制定一个基本的本地量子场论的引力的基础上的度量场似乎是在冲突的至少一个这些性质。在量子霍氏万有引力中,一种以空间和时间之间的各向异性标度为特征的量子引力场论,幺正性和可重整性可以保留,而洛伦兹不变性在高能量下被牺牲,只能在低能量下以近似对称的形式出现。我回顾了各种微扰量子引力的方法,特别关注最近在量子化的Hoenavava引力,支持其理论地位作为一个单一的,可重正化和紫外线完整的引力量子理论的进展。

英文摘要:

For any fundamental quantum field theory, unitarity, renormalizability, and relativistic invariance are considered to be essential properties. Unitarity is inevitably connected to the probabilistic interpretation of the quantum theory, while renormalizability guarantees its completeness. Relativistic invariance, in turn, is a symmetry which derives from the structure of spacetime. So far, the perturbative attempt to formulate a fundamental local quantum field theory of gravity based on the metric field seems to be in conflict with at least one of these properties. In quantum Hořava gravity, a quantum Lifshitz field theory of gravity characterized by an anisotropic scaling between space and time, unitarity and renormalizability can be retained while Lorentz invariance is sacrificed at high energies and must emerge only as approximate symmetry at low energies. I review various approaches to perturbative quantum gravity with a particular focus on recent progress in the quantization of Hořava gravity, supporting its theoretical status as a unitary, renormalizable and ultraviolet-complete quantum theory of gravity.

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