Combining Universal and Odd RR Axions for Aligned Natural Inflation

Abstract

We successfully embed the Kim-Nilles-Peloso (KNP) alignment mechanism for enhancing the axion decay constant in the context of large volume type IIB orientifolds. The flat direction is generated in the plane of ($C_0$-$C_2$) axions corresponding to the involutively even universal axion $C_0$ and odd axion $C_2$, respectively. The moduli stabilization with large volume scheme has been established as well.

Comments: version 3, 28 pages, 7 figures and 3 tables, typos fixed, Evolution of heavier axionic combination (in two-field KNP-type potential) has been added (in section 4) to justify the single field approach, version to appear in JCAP