Abstract
To obtain natural inflation with large tensor-to-scalar ratio in string framework, we need a special moduli stabilization mechanism which can separate the masses of real and imaginary components of Kähler moduli at different scales, and achieve a trans-Planckian axion decay constant from sub-Planckian axion decay constants. In this work, we stabilize the matter fields by F-terms and the real components of Kähler moduli by D-terms of two anomalous U(1)X × U(1)A symmetries strongly at high scales, while the corresponding axions remain light due to their independence on the Fayet-Iliopoulos (FI) term in moduli stabilization. The racetrack-type axion superpotential is obtained from gaugino condensations of the hidden gauge symmetries SU(n)×SU(m) with massive matter fields in the bi-fundamental respresentations. The axion alignment via Kim-Nilles-Pelroso (KNP) mechanism corresponds to an approximate S 2 exchange symmetry of two Kähler moduli in our model, and a slightly S 2 symmetry breaking leads to the natural inflation with super-Planckian decay constant.
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Li, T., Li, Z. & Nanopoulos, D.V. Aligned natural inflation and moduli stabilization from anomalous U(1) gauge symmetries. J. High Energ. Phys. 2014, 12 (2014). https://doi.org/10.1007/JHEP11(2014)012
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DOI: https://doi.org/10.1007/JHEP11(2014)012