Asymptotically safe cosmology - A status report

Journal
Date Issued
2017
Author(s)
•
Saueressig, Frank
DOI
Abstract
Asymptotic safety, based on a non-Gaussian fixed point of the gravitational renormalization group flow, provides an elegant mechanism for completing the gravitational force at sub-Planckian scales. At high energies, the fixed point controls the scaling of couplings such that unphysical divergences are absent, while the emergence of classical low-energy physics is linked to a crossover between two renormalization group fixed points. These features make asymptotic safety an attractive framework for the building of a cosmological model. The resulting scenarios may naturally give rise to a quantum-gravity-driven inflationary phase in the very early universe and an almost scale-free fluctuation spectrum. Moreover, effective descriptions arising from an improvement of the renormalization group permit a direct comparison to cosmological observations as, e.g., Planck data.
Volume
18
Issue
3-4
Start page
254
Uri
Url
Issn Identifier
1631-0705
Ads BibCode
2017CRPhy..18..254B
Rights
open.access
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