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 - Funding Information:
We thank Jan Hamann, Gonzalo Palma and Paul Shellard for helpful discussions. SA, JG, DKH and SS acknowledge support from the Korea Ministry of Education, Science and Technology , Gyeongsangbuk-Do and Pohang City for Independent Junior Research Groups at the Asia Pacific Center for Theoretical Physics. JG is also supported in part by a Starting Grant through the Basic Science Research Program of the National Research Foundation of Korea ( 2013R1A1A1006701 ) and by TJ Park Science Fellowship of POSCO TJ Park Foundation . DKH acknowledges Laboratoire APC-PCCP, Université Paris Diderot and Sorbonne Paris Cité (DXCACHEXGS) and also the financial support of the UnivEarthS Labex program at Sorbonne Paris Cité ( ANR-10-LABX-0023 and ANR-11-IDEX-0005-02 ). AS would like to acknowledge the support of the National Research Foundation of Korea ( 2013R1A1A2013795 and 2016R1C1B2016478 ). SS is supported by the FONDECYT 2016 Post-doctoral Grant 3160299 .
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 -