Neutrino Mass, Dark Energy, and the Linear Growth Factor

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dc.creatorKiakotou, Angeliki
dc.creatorElgaroy, Oystein
dc.creatorLahav, Ofer
dc.date2007-09-03
dc.date2008-03-28
dc.date.accessioned2026-07-07T11:19:03Z
dc.date.available2026-07-07T11:19:03Z
dc.descriptionWe study the degeneracies between neutrino mass and dark energy as they manifest themselves in cosmological observations. In contradiction to a popular formula in the literature, the suppression of the matter power spectrum caused by massive neutrinos is not just a function of the ratio of neutrino to total mass densities f_nu=Omega_nu/Omega_m, but also each of the densities independently. We also present a fitting formula for the logarithmic growth factor of perturbations in a flat universe, f(z, k;f_nu,w,Omega_DE)= (1-A(k)*Omega_DE*f_nu+B(k)*f_nu^2-C(k)*f_nu^3)*Omega_m(z)^alpha, where alpha depends on the dark energy equation of state parameter w. We then discuss cosmological probes where the f factor directly appears: peculiar velocities, redshift distortion and the Intergrated Sachs-Wolfe effect. We also modify the approximation of Eisenstein & Hu (1999) for the power spectrum of fluctuations in the presence of massive neutrinos and provide a revised code (http://www.star.ucl.ac.uk/~lahav/nu_matter_power.f)
dc.description8 pages, 7 figures. Updated version- The linear growth factor equation is now scale dependent
dc.identifierhttps://arxiv.org/abs/0709.0253
dc.identifierhttp://arxiv.org/abs/0709.0253
dc.identifierPhys.Rev.D77:063005,2008
dc.identifierdoi:10.1103/PhysRevD.77.063005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193554
dc.subjectAstrophysics
dc.titleNeutrino Mass, Dark Energy, and the Linear Growth Factor
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