Inflationary universe from higher-derivative quantum gravity
  We consider higher-derivative quantum gravity where renormalization group
improved effective action beyond one-loop approximation is derived. Using this
effective action, the quantum-corrected FRW equations are analyzed. De Sitter
universe solution is found. It is demonstrated that such de Sitter inflationary
universe is instable. The slow-roll inflationary parameters are calculated. The
contribution of renormalization group improved Gauss-Bonnet term to
quantum-corrected FRW equations as well as to instability of de Sitter universe
is estimated. It is demonstrated that in this case the spectral index and
tensor-to-scalar ratio are consistent with Planck data.
