The cosmic neutrino background and the age of the Universe

被引：22

作者：

De Bernardis, Francesco ^{[1
,2
]}

Melchiorri, Alessandro ^{[1
,2
]}

Verde, Licia ^{[3
,4
,5
]}

Jimenez, Raul ^{[3
,4
,5
]}

机构：

[1] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy

[2] Univ Roma La Sapienza, Sezione INFN, I-00185 Rome, Italy

[3] Campus UAB, ICREA, Bellaterra, Spain

[4] Campus UAB, Inst Space Sci, CSIC IEEC, Bellaterra, Spain

[5] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2008年 / 03期

关键词：

CMBR experiments; cosmological neutrinos; neutrino properties; surveys of galaxies;

D O I：

10.1088/1475-7516/2008/03/020

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss the cosmological degeneracy of the age of the Universe, the Hubble parameter and the effective number of relativistic particles Ne.. We show that independent determinations of the Hubble parameter H(z) such as those recently provided by Simon et al (2005 Phys. Rev. D 71 123001), combined with other cosmological data sets, can provide the most stringent constraints on N-eff, yielding N-eff = 3.7(-1.2)(+1.1) at 95% confidence level. A neutrino background is detected with high significance: Ne. > 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 of 3.

引用

页数：9

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