Anisotropies in the neutrino background: An update

Details Anisotropies in the neutrino background: An update Anisotropies in the neutrino background: An update

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvd..74l7301m&link_type=abstract

Physical Review D, vol. 74, Issue 12, id. 127301

Mathematics

Logic

4

Background Radiations

Scientific paper

We update a previous search for anisotropies in the neutrino background using the new results from the WMAP satellite. We found that the new data confirm the indication for anisotropies in the neutrino background at about ˜2σ c.l.. Parametrizing the neutrino background through the viscosity parameter cvis2, we demonstrate that current cosmological data provide the constraint cvis2>0.145 at 95% c.l. We discuss the stability of the result when the assumptions of massless neutrinos and the number of massless neutrino families are relaxed. In particular, we found that an extra background of relativistic particles, still compatible with the data, prefers anisotropic stresses with cvis2>0.09 at 95% c.l..

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