Asymptotically safe inflation from quadratic gravity
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.
- Publication:
-
Physics Letters B
- Pub Date:
- November 2015
- DOI:
- 10.1016/j.physletb.2015.10.005
- arXiv:
- arXiv:1507.03375
- Bibcode:
- 2015PhLB..750..638B
- Keywords:
-
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- E-Print:
- 6 pages, 4 figures. Physics Letters B, to appear