Non-Minimal Two-Loop Inflation
  We investigate the chaotic inflationary model using the two-loop effective
potential of a self-interacting scalar field theory in curved spacetime. We use
the potential which contains a non-minimal scalar curvature coupling and a
quartic scalar self-interaction. We analyze the Lyapunov stability of de Sitter
solution and show the stability bound. Calculating the inflationary parameters,
we systematically explore the spectral index $n_s$ and the tensor-to-scalar
ratio $r$, with varying the four parameters, the scalar-curvature coupling
$\xi_0$, the scalar quartic coupling $\lambda_0$, the renormalization scale
$\mu$ and the e-folding number $N$. It is found that the two-loop correction on
$n_s$ is much larger than the leading-log correction, which has previously been
studied. We show that the model is consistent with the observation by Planck
with WMAP and a recent joint analysis of BICEP2.
