dc.contributor.author |
Chen, X |
en |
dc.contributor.author |
Easther, Richard |
en |
dc.contributor.author |
Lim, EA |
en |
dc.date.accessioned |
2012-04-02T00:48:34Z |
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dc.date.issued |
2006-11-22 |
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dc.identifier.citation |
JCAP 2007(6):1-20 22 Nov 2006 |
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dc.identifier.issn |
1475-7516 |
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dc.identifier.uri |
http://hdl.handle.net/2292/16320 |
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dc.description.abstract |
We compute the 3-point correlation function for a general model of inflation driven by a single, minimally coupled scalar field. Our approach is based on the numerical evaluation of both the perturbation equations and the integrals which contribute to the 3-point function. Consequently, we can analyze models where the potential has a "feature", in the vicinity of which the slow roll parameters may take on large, transient values. This introduces both scale and shape dependent non-Gaussianities into the primordial perturbations. As an example of our methodology, we examine the ``step'' potentials which have been invoked to improve the fit to the glitch in the $<TT>$ $C_l$ for $l \sim 30$, present in both the one and three year WMAP data sets. We show that for the typical parameter values, the non-Gaussianities associated with the step are far larger than those in standard slow roll inflation, and may even be within reach of a next generation CMB experiment such as Planck. More generally, we use this example to explain that while adding features to potential can improve the fit to the 2-point function, these are generically associated with a greatly enhanced signal at the 3-point level. Moreover, this 3-point signal will have a very nontrivial shape and scale dependence, which is correlated with the form of the 2-point function, and may thus lead to a consistency check on the models of inflation with non-smooth potentials. |
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dc.publisher |
IOP Publishing Ltd; SISSA |
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dc.relation.ispartofseries |
Journal of Cosmology and Astroparticle Physics |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.title |
Large non-Gaussianities in single-field inflation |
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dc.type |
Journal Article |
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dc.identifier.doi |
10.1088/1475-7516/2007/06/023 |
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pubs.issue |
6 |
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pubs.begin-page |
1 |
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pubs.volume |
2007 |
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dc.rights.holder |
Copyright: IOP Publishing Ltd; SISSA |
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pubs.author-url |
http://arxiv.org/abs/astro-ph/0611645v3 |
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pubs.end-page |
20 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
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pubs.elements-id |
264319 |
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pubs.org-id |
Science |
en |
pubs.org-id |
Physics |
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pubs.arxiv-id |
astro-ph/0611645 |
en |
pubs.record-created-at-source-date |
2012-04-02 |
en |