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arXiv 2408.04282hep-thgr-qcmath-phmath.MP
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作为引力规范理论的宇宙学外尔-爱因斯坦立方引力

Cosmological Weyl-Einsteinian-Cubic Gravity as a Gauge Theory of Gravity

Suat Dengiz

AI总结:

本研究构建了无带量纲参数的外尔-爱因斯坦立方引力规范理论,揭示其低能极限与共形对称性破缺机制,明确其允许的真空时空类型,并指出非微扰贡献等方向有待深入研究。

摘要:

我们通过阿贝尔规范场与经过恰当调谐的补偿实标量场,构建了作为立方引力规范理论的外尔-爱因斯坦立方引力(ECG)。该模型不存在任何带量纲的参数。在最大对称时空中的定域非共形不变真空(即破缺相)中,当标量场的真空期望值被固定为普朗克质量标度时,裸ECG作为外尔-ECG的低能极限出现。此处(反)德西特背景的自然存在会自发破缺外尔定域共形对称性,其机制类似于希格斯机制;而在平直真空中,该对称性通过Coleman-Weinberg机制在单圈阶的重整化标度处发生辐射破缺。该模型允许反德西特空间和平直空间作为真空时空解,但不允许德西特空间作为真空解。该模型的性质值得进一步探索,尤其是非微扰贡献(例如瞬子和/或反瞬子),例如在复兴或快子凝聚语境下的相关问题需要详细研究。

英文摘要:

We construct a Weyl-Einsteinian-Cubic Gravity (ECG) as a cubic gauge theory of gravity via abelian gauge and properly tuned compensating real scalar fields. The model is free from any dimensionful parameters. The bare ECG emerges as the lower energy limit of the Weyl-ECG in the local {\it non}-conformal-invariant vacua (i.e., broken phase) in the maximally symmetric spacetimes fixing the vacuum expectation value of the scalar field to the Planck mass scale. Here, the natural presence of (anti-) de Sitter backgrounds spontaneously breaks Weyl's local conformal symmetry akin to the Higgs mechanism, while it is radiatively broken at the renormalization scale at the one-loop level in flat vacua through the Coleman-Weinberg mechanism. The model allows anti-de Sitter and flat spaces but does not allow de Sitter to be vacuum spacetime solutions. The properties of the model deserve further exploration, specifically, those of nonperturbative (e.g., instantons and/or anti-instantons) contributions, for example, in the resurgence or tachyon condensation context requires detailed study.

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