The Cosmic Neutrino Background and the Age of the Universe
| dc.creator | de Bernardis, Francesco | |
| dc.creator | Melchiorri, Alessandro | |
| dc.creator | Verde, Licia | |
| dc.creator | Jimenez, Raul | |
| dc.date | 2007-07-27 | |
| dc.date | 2008-03-08 | |
| dc.date.accessioned | 2026-07-07T11:41:38Z | |
| dc.date.available | 2026-07-07T11:41:38Z | |
| dc.description | We discuss the cosmological degeneracy between the age of the Universe, the Hubble parameter and the effective number of relativistic particles N_eff. We show that independent determinations of the Hubble parameter H(z) as those recently provided by Simon,Verde, Jimenez (2006), combined with other cosmological data sets can provide the most stringent constraint on N_eff, yielding N_eff=3.7 (-1.2) (+1.1) at 95% confidence level. A neutrino background is detected with high significance: N_eff >1.8 at better than 99% confidence level. Constraints on the age of the universe in the framework of an extra background of relativistic particles are improved by a factor 3. | |
| dc.description | JCAP, in press | |
| dc.identifier | https://arxiv.org/abs/0707.4170 | |
| dc.identifier | http://arxiv.org/abs/0707.4170 | |
| dc.identifier | JCAP0803:020,2008 | |
| dc.identifier | doi:10.1088/1475-7516/2008/03/020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/200606 | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | The Cosmic Neutrino Background and the Age of the Universe | |
| dc.type | text |