S-dual Inflation: BICEP2 data without unlikeliness
  We show that S-dual inflationary potentials solve the unlikeliness problem manifested in Planck data and explain the excess B-mode power observed by the BICEP2 experiment as arising from primordial tensor fluctuations. 
Luis A. Anchordoqui, Vernon Barger, Haim Goldberg, Xing Huang, and   Danny Marfatia
hep-ph astro-ph.CO hep-th