Aligned Natural Inflation: Monodromies of two Axions
  Natural (axionic) inflation can accommodate sizeable primordial tensor modes but suffers from the necessity of trans-Planckian variations of the inflaton field. This problem can be solved via the mechanism of aligned axions arXiv:hep-ph/0409138, where the aligned axion spirals down in the potential of other axions. We elaborate on the mechanism in view of the recently reported observations of the BICEP2 collaboration arXiv:1403.3985. 
Rolf Kappl, Sven Krippendorf, Hans Peter Nilles
hep-th astro-ph.CO hep-ph