The R^2 phase-diagram of QEG and its spectral dimension

The R^2 phase-diagram of QEG and its spectral dimension
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QEG 的 R^2 相图及其光谱维数

DOI:
10.1103/physrevd.86.024018
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发表时间:
2012
期刊:
影响因子:
5
通讯作者:
F. Saueressig
F. Saueressig
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Stefan Rechenberger;F. Saueressig

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在引力渐近安全程序中,详细分析了三维和四维时空中截断的重整化群(RG)流。特别地,我们构造了从非高斯UV不动点发出的具有长的经典区域的RG轨迹,其中有效平均作用量很好地被经典的爱因斯坦-希尔伯特作用量近似。作为应用,我们研究了由这些轨迹产生的有效量子爱因斯坦引力时空的谱维度,证明了多重分形时空在截断理论空间的扩展下是健壮的。我们证明了谱维恒定的区域既可以归因于RG不动点的普遍特征,也可以归因于函数的奇异轨迹。
Within the gravitational asymptotic safety program, the renormalization group (RG) flow of the ${R}^{2}$ truncation in three and four spacetime dimensions is analyzed in detail. In particular, we construct RG trajectories which emanate from the non-Gaussian UV fixed point and possess long classical regimes where the effective average action is well approximated by the classical Einstein-Hilbert action. As an application we study the spectral dimension of the effective quantum Einstein gravity spacetimes resulting from these trajectories, establishing that the picture of a multifractal spacetime is robust under the extension of the truncated theory space. We demonstrate that regimes of constant spectral dimension can either be attributed to universal features of RG fixed points or singular loci in the $\ensuremath{\beta}$ functions.
因果量子引力和尺度相关光谱维度的多图模型
DOI: 10.1088/1751-8113/45/35/355001
发表时间: 2012
期刊: Mathematical and Theoretical
影响因子: --
作者:
Giasemidis G
通讯作者: Giasemidis G
DOI: 10.48550/arxiv.1202.2710
发表时间: 2012
期刊: --
影响因子: --
作者:
Giasemidis G
通讯作者: Giasemidis G
DOI: 10.1103/physrevd.83.104022
发表时间: 2011-03-11
期刊: PHYSICAL REVIEW D
影响因子: 5
作者:
Berry, Christopher P. L.;Gair, Jonathan R.
通讯作者: Gair, Jonathan R.