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We search for the presence of cosmological neutrino background (CNB)anisotropies in recent WMAP 5-year data using their signature imprinted onmodifications to cosmic microwave background (CMB) anisotropy power spectrum.By parametrizing the neutrino background anisotropies with the speed viscosityparameter $c_\vis$, we find that the WMAP 5-year data alone provide only a weakindication for CNB anisotropies with $c_\vis^2 > 0.06$ at the 95% confidencelevel. When we combine CMB anisotropy data with measurements of galaxyclustering, SN-Ia Hubble diagram, and other cosmological information, thedetection increases to $c_\vis^2 > 0.16$ at the same 95% confidence level.Future data from Planck, combined with a weak lensing survey such as the oneexpected with DUNE from space, will be able to measure the CNB anisotropyparameter at about 10% accuracy. We discuss the degeneracy between neutrinobackground ansiotropies and other cosmological para meters such as the numberof effective neutrinos species and the dark energy equation of state.

Anisotropies in the Cosmic Neutrino Background after WMAP 5-year Data