An effective action for asymptotically safe gravity

TL;DR

This paper derives an effective action for asymptotically safe gravity, revealing a landscape of inflationary solutions with unstable de Sitter phases, impacting early universe cosmology.

Contribution

It introduces a new effective action capturing the renormalized flow near the non-Gaussian fixed point in asymptotically safe gravity.

Findings

Identifies a landscape of inflationary solutions with unstable de Sitter phases.

Shows these solutions can sustain a large number of e-folds.

Provides implications for early universe cosmology.

Abstract

Asymptotically safe theories of gravitation have received great attention in recent times. In this framework an effective action embodying the basic features of the renormalized flow around the non-gaussian fixed point is derived and its implications for the early universe are discussed. In particular, a "landscape" of a countably infinite number of cosmological inflationary solutions characterized by an unstable de Sitter phase lasting for a large enough number of e-folds is found.