多重分形时空、渐近安全性和Hoenava-Lifshitz引力
Multifractional spacetimes, asymptotic safety and Hořava-Lifshitz gravity
摘要：
我们比较了最近制定的多重分形时空与基于重整化群（RG）的量子引力场论，如渐近安全性和Hoenava-Lifshitz引力。在这两种情况下，时空维度随探测尺度的变化都是通过测量工具（“棒”）适应尺度来实现的，但方式不同。在多分数阶的情况下，通过位置空间测度的自适应，其可以被编码为有效坐标的显式尺度依赖。在基于RG理论的情况下，通过动量的适应。这两幅图像相互映射，从而从另一个角度呈现了基于RG理论的时空分形结构。
英文摘要：
We compare the recently formulated multifractional spacetimes with field theories of quantum gravity based on the renormalization group (RG), such as asymptotic safety and Hořava--Lifshitz gravity. The change of spacetime dimensionality with the probed scale is realized in both cases by an adaptation of the measurement tools ("rods") to the scale, but in different ways. In the multifractional case, by an adaptation of the position-space measure, which can be encoded into an explicit scale dependence of effective coordinates. In the case of RG-based theories, by an adaptation of the momenta. The two pictures are mapped into each other, thus presenting the fractal structure of spacetime in RG-based theories under an alternative perspective.
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