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To obtain natural inflation with large tensor-to-scalar ratio in stringframework, we need a special moduli stabilization mechanism which can separatethe masses of real and imaginary components of K\"ahler moduli at differentscales, and achieve a trans-Planckian axion decay constant from sub-Planckianaxion decay constants. In this work, we stabilize the matter fields by F-termsand the real components of K\"ahler moduli by D-terms of two anomalous$U(1)_X\times U(1)_A$ symmetries strongly at high scales, while thecorresponding axions remain light due to their independence on theFayet-Iliopoulos (FI) term in moduli stabilization. The racetrack-type axionsuperpotential is obtained from gaugino condensations of the hidden gaugesymmetries $SU(n)\times SU(m)$ with massive matter fields in the bi-fundamentalrespresentations. The axion alignment via Kim-Nilles-Pelroso (KNP) mechanismcorresponds to an approximate $S_2$ exchange symmetry of two K\"ahler moduli inour model, and a slightly $S_2$ symmetry breaking leads to the naturalinflation with super-Planckian decay constant.

Aligned Natural Inflation and Moduli Stabilization from Anomalous $U(1)$ Gauge Symmetries