Robust neutrino constraints by combining low redshift observations with the CMB
- Institute for Sciences of the Cosmos (ICC), University of Barcelona, Marti i Franques 1, 08028, Barcelona (Spain)
- ICREA and Instituto de Ciencias del Cosmos, Universitat de Barcelona, Marti i Franques 1, 08028, Barcelona (Spain)
- Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia, Valencia (Spain)
We illustrate how recently improved low-redshift cosmological measurements can tighten constraints on neutrino properties. In particular we examine the impact of the assumed cosmological model on the constraints. We first consider the new HST H{sub 0} = 74.2±3.6 measurement by Riess et al. (2009) and the σ{sub 8}(Ω{sub m}/0.25){sup 0.41} = 0.832±0.033 constraint from Rozo et al. (2009) derived from the SDSS maxBCG Cluster Catalog. In a ΛCDM model and when combined with WMAP5 constraints, these low-redshift measurements constrain Σm{sub ν} < 0.4 eV at the 95% confidence level. This bound does not relax when allowing for the running of the spectral index or for primordial tensor perturbations. When adding also Supernovae and BAO constraints, we obtain a 95% upper limit of Σm{sub ν} < 0.3eV. We test the sensitivity of the neutrino mass constraint to the assumed expansion history by both allowing a dark energy equation of state parameter w≠−1 and by studying a model with coupling between dark energy and dark matter, which allows for variation in w, Ω{sub k}, and dark coupling strength ξ. When combining CMB, H{sub 0} and the SDSS LRG halo power spectrum from Reid et al. 2009, we find that in this very general model, Σm{sub ν} < 0.51 eV with 95% confidence. If we allow the number of relativistic species N{sub rel} to vary in a ΛCDM model with Σm{sub ν} = 0, we find N{sub rel} = 3.76{sup +0.63}{sub −0.68}({sup +1.38}{sub −1.21}) for the 68% and 95% confidence intervals. We also report prior-independent constraints, which are in excellent agreement with the Bayesian constraints.
- OSTI ID:
- 22272937
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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