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arXiv 2402.01260hep-thgr-qc
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叶状引力-物质系统的整体流

Global Flows of Foliated Gravity-Matter Systems

Guus Korver, Frank Saueressig, Jian Wang

AI总结:

该研究基于ADM形式体系的叶状时空结构,利用Wetterich方程分析含最小耦合物质场的引力系统重整化群流,推导渐近安全对物质场数的约束,发现引力子质量红外不动点可避免负质量平方,补充了此前的相关研究。

摘要:

渐近安全是获得自洽且具预测性引力量子理论的一种很有前景的机制。ADM形式体系(即阿诺维特-德塞-米斯纳形式体系)可在该框架中引入一个(欧几里得)时间方向,它通过将引力自由度编码为时移函数、位移矢量以及衡量空间切片上距离的度规,为时空赋予叶状结构。我们使用Wetterich方程研究从空间度规中提取的引力子2点函数的重整化群流,该流由补充了最小耦合标量场与矢量场的叶状Einstein-Hilbert作用量所生成的3点和4点顶点驱动。我们推导了渐近安全对物质场数量施加的约束,此外还表明纯引力情形下得到的相图在这些约束范围内具有定性稳定性。一个引人关注的特性是引力子质量存在IR(红外)不动点,它可阻止质量平方取负值。该特性在任意数量的物质场下都成立,尤其是在不存在能让理论达到渐近安全的合适相互作用不动点的情形中也依然存在。我们的工作通过纳入物质场的贡献,补充了该主题此前的相关研究。

英文摘要:

Asymptotic safety is a promising mechanism for obtaining a consistent and predictive quantum theory for gravity. The ADM formalism allows to introduce a (Euclidean) time-direction in this framework. It equips spacetime with a foliation structure by encoding the gravitational degrees of freedom in a lapse function, shift vector, and a metric measuring distances on the spatial slices. We use the Wetterich equation to study the renormalization group flow of the graviton 2-point function extracted from the spatial metric. The flow is driven by the 3- and 4-point vertices generated by the foliated Einstein-Hilbert action supplemented by minimally coupled scalar and vector fields. We derive bounds on the number of matter fields cast by asymptotic safety. Moreover, we show that the phase diagram obtained in the pure gravity case is qualitatively stable within these bounds. An intriguing feature is the presence of an IR-fixed point for the graviton mass which prevents the squared mass taking negative values. This feature persists for any number of matter fields and, in particular, also in situations where there is no suitable interacting fixed point rendering the theory asymptotically safe. Our work complements earlier studies of the subject by taking contributions from the matter fields into account.

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