Observational bounds on the cosmic radiation density

Details Observational bounds on the cosmic radiation density Observational bounds on the cosmic radiation density

2007-05-03

arxiv.org/abs/0705.0440v2

JCAP0708:021,2007

Astronomy and Astrophysics

Astrophysics

23 pages, 3 figures, uses iopart.cls; v2: 1 new figure, references added, matches published version

Scientific paper

10.1088/1475-7516/2007/08/021

We consider the inference of the cosmic radiation density, traditionally parameterised as the effective number of neutrino species N_eff, from precision cosmological data. Paying particular attention to systematic effects, notably scale-dependent biasing in the galaxy power spectrum, we find no evidence for a significant deviation of N_eff from the standard value of N_eff^0=3.046 in any combination of cosmological data sets, in contrast to some recent conclusions of other authors. The combination of all available data in the linear regime prefers, in the context of a ``vanilla+N_eff'' cosmological model, 1.1

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