The trouble with asymptotically safe inflation
Chao Fang, Qing-Guo Huang
TL;DR
This paper critically examines asymptotically safe inflation, revealing that gravitational wave perturbations become ghosts and yield negative power spectra, indicating fundamental issues with the model.
Contribution
It provides a detailed perturbation analysis of asymptotically safe inflation, identifying ghost modes and negative power spectra as critical problems.
Findings
Gravitational wave modes become ghosts in the model
The power spectrum of gravitational waves is negative
Asymptotically safe inflation faces serious theoretical issues
Abstract
In this paper we investigate the perturbation theory of the asymptotically safe inflation and we find that all modes of gravitational waves perturbation become ghosts in order to achieve a large enough number of e-folds. Formally we can calculate the power spectrum of gravitational waves perturbation, but we find that it is negative. It indicates that there is serious trouble with the asymptotically safe inflation.
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