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- W3102758535 abstract "We have derived new bounds on the relativistic energy density in the Universe from cosmic microwave background (CMB), large scale structure (LSS), and type Ia supernova (SNI-a) observations. In terms of the effective number of neutrino species a bound of N_nu = 4.2^{+1.2}_{-1.7} is derived at 95% confidence. This bound is significantly stronger than previous determinations, mainly due to inclusion of new CMB and SNI-a observations. The absence of a cosmological neutrino background (N_nu = 0) is now excluded at 5.4 sigma. The value of N_nu is compatible with the value derived from big bang nucleosynthesis considerations, marking one of the most remarkable successes of the standard cosmological model. In terms of the cosmological helium abundance, the CMB, LSS, and SNI-a observations predict a value of 0.240 < Y < 0.281." @default.
- W3102758535 created "2020-11-23" @default.
- W3102758535 creator A5059867176 @default.
- W3102758535 date "2006-01-03" @default.
- W3102758535 modified "2023-09-25" @default.
- W3102758535 title "A new constraint on the cosmological background of relativistic particles" @default.
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- W3102758535 doi "https://doi.org/10.1088/1475-7516/2006/01/001" @default.
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