New constraints on primordial gravitational waves from Planck 2015
We show that the new precise measurements of Cosmic Microwave Background (CMB) temperature and polarization anisotropies made by the Planck satellite significantly improves previous constraints on the cosmic gravitational waves background (CGWB) at frequencies f>10−15 Hz. On scales smaller than t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-09-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316304191 |
| _version_ | 1818911363140943872 |
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| author | Luca Pagano Laura Salvati Alessandro Melchiorri |
| author_facet | Luca Pagano Laura Salvati Alessandro Melchiorri |
| author_sort | Luca Pagano |
| collection | DOAJ |
| description | We show that the new precise measurements of Cosmic Microwave Background (CMB) temperature and polarization anisotropies made by the Planck satellite significantly improves previous constraints on the cosmic gravitational waves background (CGWB) at frequencies f>10−15 Hz. On scales smaller than the horizon at the time of decoupling, primordial gravitational waves contribute to the total radiation content of the Universe. Considering adiabatic perturbations, CGWB affects temperature and polarization CMB power spectra and matter power spectrum in a manner identical to relativistic particles. Considering the latest Planck results we constrain the CGWB energy density to Ωgwh2<1.7×10−6 at 95% CL. Combining CMB power spectra with lensing, BAO and primordial Deuterium abundance observations, we obtain Ωgwh2<1.2×10−6 at 95% CL, improving previous Planck bounds by a factor 3 and the recent direct upper limit from the LIGO and VIRGO experiments a factor 2. A combined analysis of future satellite missions as COrE and EUCLID could improve current bound by more than an order of magnitude. |
| first_indexed | 2024-12-19T22:57:30Z |
| format | Article |
| id | doaj.art-ffa78b2729324bc59c48da5cbd3e50a6 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-19T22:57:30Z |
| publishDate | 2016-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-ffa78b2729324bc59c48da5cbd3e50a62022-12-21T20:02:37ZengElsevierPhysics Letters B0370-26931873-24452016-09-01760C82382510.1016/j.physletb.2016.07.078New constraints on primordial gravitational waves from Planck 2015Luca Pagano0Laura Salvati1Alessandro Melchiorri2Institut d'Astrophysique Spatiale, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bât. 121, 91405 Orsay cedex, FrancePhysics Department and INFN, Università di Roma “La Sapienza”, Ple. Aldo Moro 2, 00185, Rome, ItalyPhysics Department and INFN, Università di Roma “La Sapienza”, Ple. Aldo Moro 2, 00185, Rome, ItalyWe show that the new precise measurements of Cosmic Microwave Background (CMB) temperature and polarization anisotropies made by the Planck satellite significantly improves previous constraints on the cosmic gravitational waves background (CGWB) at frequencies f>10−15 Hz. On scales smaller than the horizon at the time of decoupling, primordial gravitational waves contribute to the total radiation content of the Universe. Considering adiabatic perturbations, CGWB affects temperature and polarization CMB power spectra and matter power spectrum in a manner identical to relativistic particles. Considering the latest Planck results we constrain the CGWB energy density to Ωgwh2<1.7×10−6 at 95% CL. Combining CMB power spectra with lensing, BAO and primordial Deuterium abundance observations, we obtain Ωgwh2<1.2×10−6 at 95% CL, improving previous Planck bounds by a factor 3 and the recent direct upper limit from the LIGO and VIRGO experiments a factor 2. A combined analysis of future satellite missions as COrE and EUCLID could improve current bound by more than an order of magnitude.http://www.sciencedirect.com/science/article/pii/S0370269316304191 |
| spellingShingle | Luca Pagano Laura Salvati Alessandro Melchiorri New constraints on primordial gravitational waves from Planck 2015 Physics Letters B |
| title | New constraints on primordial gravitational waves from Planck 2015 |
| title_full | New constraints on primordial gravitational waves from Planck 2015 |
| title_fullStr | New constraints on primordial gravitational waves from Planck 2015 |
| title_full_unstemmed | New constraints on primordial gravitational waves from Planck 2015 |
| title_short | New constraints on primordial gravitational waves from Planck 2015 |
| title_sort | new constraints on primordial gravitational waves from planck 2015 |
| url | http://www.sciencedirect.com/science/article/pii/S0370269316304191 |
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