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Measuring the cosmological background of relativistic with the Wilkinson Microwave Anisotropy Probe

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Measuring the cosmological background of relativistic with the Wilkinson Microwave Anisotropy Probe

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Crotty, Patrick; Lesgourgues, Julien; Pastor Carpi, Sergio

Aquest document és un/a article, creat/da en: 2003

We show that the first year results of the Wilkinson Microwave Anisotropy Probe (WMAP) constrain very efficiently the energy density in relativistic particles in the universe. We derive new bounds on additional relativistic degrees of freedom expressed in terms of an excess in the effective number of light neutrinos Delta Neff. Within the flat LambdaCDM scenario, the allowed range is Delta Neff < 6 (95% CL) using WMAP data only, or -2.6 < Delta Neff < 4 with the prior H0= 72 \pm 8 km/s/Mpc. When other cosmic microwave background and large scale structure experiments are taken into account, the window shrinks to -1.6 < Delta Neff < 3.8. These results are in perfect agreement with the bounds from primordial nucleosynthesis. Non-minimal cosmological models with extra relativistic degrees of freedom are now severely restricted.

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