TY - JOUR

T1 - Direct search for features in the primordial bispectrum

AU - Appleby, Stephen

AU - Gong, Jinn Ouk

AU - Hazra, Dhiraj Kumar

AU - Shafieloo, Arman

AU - Sypsas, Spyros

N1 - Publisher Copyright:
© 2016 The Author(s)

PY - 2016/9/10

Y1 - 2016/9/10

N2 - 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∼0.06 Mpc−1 and k∼0.014 Mpc−1 there are marginal 2σ deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.

AB - 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∼0.06 Mpc−1 and k∼0.014 Mpc−1 there are marginal 2σ deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.

UR - http://www.scopus.com/inward/record.url?scp=84978280326&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.07.004

DO - 10.1016/j.physletb.2016.07.004

M3 - Article

AN - SCOPUS:84978280326

SN - 0370-2693

VL - 760

SP - 297

EP - 301

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -