High-order corrections to inflationary perturbation spectra in quantum
  gravity
  We compute the inflationary perturbation spectra and the quantity $r+8n_{T}$
to the next-to-next-to-leading log order in quantum gravity with purely virtual
particles (which means the theory $R+R^{2}+C^{2}$ with the fakeon
prescription/projection for $C^{2}$). The spectra are functions of the
inflationary running coupling $\alpha (1/k)$ and satisfy the cosmic
renormalization-group flow equations, which determine the tilts and the running
coefficients. The tensor fluctuations receive contributions from the spin-2
fakeon $\chi_{\mu \nu }$ at every order of the expansion in powers of $\alpha
\sim 1/115$. The dependence of the scalar spectrum on the $\chi_{\mu \nu }$
mass $m_{\chi }$, on the other hand, starts from the $\alpha ^{2}$ corrections,
which are handled perturbatively in the ratio $m_{\phi }/m_{\chi }$, where
$m_{\phi }$ is the inflaton mass. The predictions have theoretical errors
ranging from $\alpha ^{4}\sim 10^{-8}$ to $\alpha ^{3}\sim 10^{-6}$. Nontrivial
issues concerning the fakeon projection at higher orders are addressed.
