2015/12/31 by Stephen Appleby, Jinn-Ouk Gong, Dhiraj Kumar Hazra +2 · 2 citations
Mathematics · Physics and Astronomy · #Anisotropy #Astrophysics #Bispectrum #Black Holes and Theoretical Physics #Cosmic microwave background #Cosmology and Gravitation Theories #Curvature #Galaxies: Formation, Evolution, Phenomena #Geometry #Mathematics #Physics #Planck #Quantum mechanics #Spectral density #Statistics #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1016/j.physletb.2016.07.004
published as Phys. Lett. B 760 (2016) 297-301 · (v1) 6 pages, 4 figures; (v2) improved results but conclusions not changed, to appear in Physics Letters B
openalex publication_date 2016/07/09 · arxiv created 2016/07/15 · arxiv updated 2017/12/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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∼0.06Mpc−1 and k∼0.014Mpc−1 there are marginal 2σ deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.