Natural Inflation from Near Alignment in Heterotic String Theory
  We propose a model for large field inflation in heterotic string theory. The construction applies the near alignment mechanism of Kim, Nilles, and Peloso. By including gaugino condensates and world-sheet instanton non-perturbative effects, we obtain a large effective axion decay constant. 
Tibra Ali, S. Shajidul Haque, Vishnu Jejjala
hep-th gr-qc