General Single Field Inflation with Large Positive Non-Gaussianity

Details General Single Field Inflation with Large Positive Non-Gaussianity General Single Field Inflation with Large Positive Non-Gaussianity

2007-12-29

arxiv.org/abs/0801.0040v3

JCAP 0803:028,2008

Astronomy and Astrophysics

Astrophysics

27 pages, 3 figure; final version published in JCAP

Scientific paper

10.1088/1475-7516/2008/03/028

Recent analysis of the WMAP three year data suggests $f_{NL}^{local}\simeq86.8$ 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, $f_{NL}^{equil}\gg1$ can be realized in single field inflation.

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