Large non-Gaussianity from two-component hybrid inflation - INSPIRE

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Large non-Gaussianity from two-component hybrid inflation

Christian T. Byrnes
(
- Heidelberg U.
)
,
Ki-Young Choi
(
- Madrid, IFT and
- Madrid, Autonoma U.
)
,
Lisa M.H. Hall
(
- Sheffield U.
)

Dec, 2008

16 pages

Published in:

JCAP 02 (2009) 017

e-Print:

0812.0807 [astro-ph]

DOI:

10.1088/1475-7516/2009/02/017

View in:

ADS Abstract Service

reference search123 citations

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Abstract: (arXiv)

We study the generation of non-Gaussianity in models of hybrid inflation with two inflaton fields, (2--brid inflation). We analyse the region in the parameter and the initial condition space where a large non-Gaussianity may be generated during slow-roll inflation which is generally characterised by a large f_NL, tau_NL and a small g_NL. For certain parameter values we can satisfy tau_NL>>f_NL^2. The bispectrum is of the local type but may have a significant scale dependence. We show that the loop corrections to the power spectrum and bispectrum are suppressed during inflation, if one assume that the fields follow a classical background trajectory. We also include the effect of the waterfall field, which can lead to a significant change in the observables after the waterfall field is destabilised, depending on the couplings between the waterfall and inflaton fields.

98.80.Cq
inflation: hybrid
non-Gaussianity
trajectory
background
slow-roll approximation
power spectrum: correction
inflaton: coupling
numerical calculations

References(79)

Figures(6)

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