Strong Dynamics and Natural Inflation
  We continue our investigation of the 4d effective field theory for closed
string axions in Type II compactifications with D-branes. The inclusion of
St\"uckelberg couplings for the axions requires the presence of chiral fermions
at D-brane intersections, whose interactions at strong non-Abelian gauge
coupling induce mass terms for the axions and scalar chiral condensate
excitations, dubbed infladrons. The set-up allows for a realization of
natural-like inflation with a closed string axion as inflaton and a flattened
scalar potential due to the back-reaction of the more massive infladrons. We
further point out that this large field inflationary model is not compromised
by axionic wormhole corrections.
