Warping the Weak Gravity Conjecture
  The Weak Gravity Conjecture, if valid, rules out simple models of Natural
Inflation by restricting their axion decay constant to be sub-Planckian. We
revisit stringy attempts to realise Natural Inflation, with a single open
string axionic inflaton from D-branes in a warped throat. We show that warping
allows the requisite super-Planckian axion decay constant to be achieved
consistently with the Weak Gravity Conjecture. However, there is a tension
between large axion decay constant and high string scale, where the requisite
high string scale is difficult to achieve in all attempts to realise large
field inflation using perturbative string theory. We comment on the Generalized
Weak Gravity Conjecture in the light of our results.
