Sub-Planckian inflation & large tensor to scalar ratio with $r\geq 0.1$
  We categorically point out why the analysis of arXiv:1404.1821 [hep-ph] is incorrect. Here we explicitly show why the sub-Planckian field excursion of the inflaton field can yield large observable tensor-to-scalar ratio, which satisfies both Planck and BICEP constraints. 
Sayantan Choudhury, Anupam Mazumdar
hep-th astro-ph.CO gr-qc hep-ph