Direct search for features in the primordial bispectrum
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016-09-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316303458 |
| _version_ | 1819053794753773568 |
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| author | Stephen Appleby Jinn-Ouk Gong Dhiraj Kumar Hazra Arman Shafieloo Spyros Sypsas |
| author_facet | Stephen Appleby Jinn-Ouk Gong Dhiraj Kumar Hazra Arman Shafieloo Spyros Sypsas |
| author_sort | Stephen Appleby |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-21T12:41:24Z |
| format | Article |
| id | doaj.art-0ae387a465c541c7a47f5ab930c1ff14 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-21T12:41:24Z |
| publishDate | 2016-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-0ae387a465c541c7a47f5ab930c1ff142022-12-21T19:03:46ZengElsevierPhysics Letters B0370-26931873-24452016-09-01760C29730110.1016/j.physletb.2016.07.004Direct search for features in the primordial bispectrumStephen Appleby0Jinn-Ouk Gong1Dhiraj Kumar Hazra2Arman Shafieloo3Spyros Sypsas4School of Physics, Korea Institute for Advanced Study, Seoul 02455, Republic of KoreaAsia Pacific Center for Theoretical Physics, Pohang 37673, Republic of KoreaAsia Pacific Center for Theoretical Physics, Pohang 37673, Republic of KoreaKorea Astronomy and Space Science Institute, Daejeon 34055, Republic of KoreaAsia Pacific Center for Theoretical Physics, Pohang 37673, Republic of KoreaWe 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.http://www.sciencedirect.com/science/article/pii/S0370269316303458 |
| spellingShingle | Stephen Appleby Jinn-Ouk Gong Dhiraj Kumar Hazra Arman Shafieloo Spyros Sypsas Direct search for features in the primordial bispectrum Physics Letters B |
| title | Direct search for features in the primordial bispectrum |
| title_full | Direct search for features in the primordial bispectrum |
| title_fullStr | Direct search for features in the primordial bispectrum |
| title_full_unstemmed | Direct search for features in the primordial bispectrum |
| title_short | Direct search for features in the primordial bispectrum |
| title_sort | direct search for features in the primordial bispectrum |
| url | http://www.sciencedirect.com/science/article/pii/S0370269316303458 |
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