AUTHOR=Choi Ki-Young , Kim Jihn E. , Kyae Bumseok 

TITLE=Perspective on completing natural inflation

JOURNAL=Frontiers in Physics

VOLUME=2

YEAR=2015

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2014.00083

DOI=10.3389/fphy.2014.00083

ISSN=2296-424X

ABSTRACT=<p>We present a perspective on the inflation paths in 2−, 3−, …, <italic>N</italic>-flation models based on the ultraviolet completion in heterotic string theory, where a number of grand unification scale axions are used. The number of non-Abelian gauge groups for a natural inflation is restricted in string compactification, and we argue that the most plausible completion of natural inflation from a theory perspective is the 2– and 3–flation.</p>