Reconstruction of scalar field theories realizing inflation consistent   with the Planck and BICEP2 results
  We reconstruct scalar field theories to realize inflation compatible with the BICEP2 result as well as the Planck. In particular, we examine the chaotic inflation model, natural (or axion) inflation model, and an inflationary model with a hyperbolic inflaton potential. We perform an explicit approach to find out a scalar field model of inflation in which any observations can be explained in principle. 
Kazuharu Bamba, Shin'ichi Nojiri and Sergei D. Odintsov
hep-th astro-ph.CO gr-qc hep-ph