The R^2 phase-diagram of QEG and its spectral dimension
The R^2 phase-diagram of QEG and its spectral dimension
复制标题
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
影响因子:
5
通讯作者:
F. Saueressig
中科院分区:
文献类型:
--
作者:
Stefan Rechenberger;F. Saueressig
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.
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
影响因子:
5
作者:
Berry, Christopher P. L.;Gair, Jonathan R.
通讯作者:
Gair, Jonathan R.