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.
