Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-03-31
Phys.Rev.D70:045016,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 7 figures. Added results with the KAOS proposal and 1 reference
Scientific paper
10.1103/PhysRevD.70.045016
We perform a new study of future sensitivities of galaxy redshift surveys to the free-streaming effect caused by neutrino masses, adding the information on cosmological parameters from measurements of primary anisotropies of the cosmic microwave background (CMB). Our reference cosmological scenario has nine parameters and three different neutrino masses, with a hierarchy imposed by oscillation experiments. Within the present decade, the combination of the Sloan Digital Sky Survey (SDSS) and CMB data from the PLANCK experiment will have a 2-sigma detection threshold on the total neutrino mass close to 0.2 eV. This estimate is robust against the inclusion of extra free parameters in the reference cosmological model. On a longer term, the next generation of experiments may reach values of order sum m_nu = 0.1 eV at 2-sigma, or better if a galaxy redshift survey significantly larger than SDSS is completed. We also discuss how the small changes on the free-streaming scales in the normal and inverted hierarchy schemes are translated into the expected errors from future cosmological data.
Lesgourgues Julien
Pastor Sergio
Perotto Laurence
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