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http://hdl.handle.net/20.500.12386/28387
Titolo: | Asymptotically safe cosmology - A status report | Autori: | BONANNO, Alfio Maurizio Saueressig, Frank |
Data pubblicazione: | 2017 | Rivista: | COMPTES RENDUS PHYSIQUE | Numero: | 18 | Fascicolo: | 3-4 | Da pagina:: | 254 | 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. | URI: | http://hdl.handle.net/20.500.12386/28387 | URL: | https://www.sciencedirect.com/science/article/pii/S1631070517300270 | ISSN: | 1631-0705 | DOI: | 10.1016/j.crhy.2017.02.002 | Bibcode ADS: | 2017CRPhy..18..254B | Fulltext: | open |
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