Comment on Asymptotically Safe Inflation
arXiv:1008.4787 · doi:10.1103/PhysRevD.82.127302
Abstract
We comment on Weinberg's interesting analysis of asymptotically safe inflation (arXiv:0911.3165). We find that even if the gravity theory exhibits an ultraviolet fixed point, the energy scale during inflation is way too low to drive the theory close to the fixed point value. We choose the specific renormalization groupflow away from the fixed point towards the infrared region that reproduces the Newton's constant and today's cosmological constant. We follow this RG flow path to scales below the Planck scale to study the stability of the inflationary scenario. Again, we find that some fine tuning is necessary to get enough efolds of infflation in the asymptotically safe inflationary scenario.
4 pages
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- Renormalisation group improvement of scalar field inflation
- Cosmological constant problem: deflation during inflation
- How universe evolves with cosmological and gravitational constants
- A solution of the dark energy and its coincidence problem based on local antigravity sources without fine-tuning or new scales
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- Five-dimensional scale-dependent black holes with constant curvature and Solv horizons
- The Possibility of Inflation in Asymptotically Safe Gravity
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