Direct search for features in the primordial bispectrum
Author
dc.contributor.author
Appleby, Stephen
Author
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Gong, Jinn-Ouk
Author
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Hazra, Dhiraj Kumar
Author
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Shafieloo, Arman
Author
dc.contributor.author
Sypsas, Spyros
Admission date
dc.date.accessioned
2017-01-16T20:20:42Z
Available date
dc.date.available
2017-01-16T20:20:42Z
Publication date
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2016
Cita de ítem
dc.identifier.citation
Physics Letters B 760 (2016) 297–301
es_ES
Identifier
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10.1016/j.physletb.2016.07.004
Identifier
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https://repositorio.uchile.cl/handle/2250/142471
Abstract
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We study features in the bispectrum of the primordial curvature perturbation correlated with the reconstructed primordial power spectrum from the observed cosmic microwave background temperature data. We first show how the bispectrum can be completely specified in terms of the power spectrum and its first two derivatives, valid for any configuration of interest. Then using a model-independent reconstruction of the primordial power spectrum from the Planck angular power spectrum of temperature anisotropies, we compute the bispectrum in different triangular configurations. We find that in the squeezed limit at k similar to 0.06 Mpc(-1) and k similar to 0.014 Mpc(-1) there are marginal 2 sigma deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.