General Single Field Inflation with Large Positive Non-Gaussianity

Abstract

Recent analysis of the WMAP three year data suggests $f_{NL}^{local}\simeq 86.8$ in the WMAP convention. It is necessary to make sure whether general single field inflation can produce a large positive $f_{NL}$ before turning to other scenarios. We give some examples to generate a large positive $f_{NL}^{equil}$ in general single field inflation. Our models are different from ghost inflation. Due to the appearance of non-conventional kinetic terms, $f_{NL}^{equil}\gg 1$ can be realized in single field inflation.

27 pages, 3 figure; final version published in JCAP

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