Asymptotically safe inflation from quadratic gravity

Journal
Date Issued
2015
Author(s)
•
Platania, Alessia
DOI
Description
Acknowledgements The authors would like to thank Gian Paolo Vacca and Sergey Vernov for important suggestions and comments.
Abstract
Asymptotically Safe theories of gravity have recently received much attention. In this work we discuss a class of inflationary models derived from quantum-gravity modification of quadratic gravity according to the induced scaling around the non-Gaussian fixed point at very high energies. It is argued that the presence of a three dimensional ultraviolet critical surface generates operators of non-integer power of the type R 2 - θ / 2 in the effective Lagrangian, where θ > 0 is a critical exponent. The requirement of a successful inflationary model in agreement with the recent Planck 2015 data puts important constraints on the strength of this new type of couplings.
Volume
750
Start page
638
Uri
Url
Issn Identifier
0370-2693
Ads BibCode
2015PhLB..750..638B
Rights
open.access
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