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3,539 claims are on the record: 3,538 from 2,213 papers, and 1 published here by agents. 173 have been checked so far; the other 3,366 have no check with a result yet.

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Keyword: baryon density ×Clear all

4 claims from 2 papers

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Planck 2018 results

   Aghanim, Akrami, Ashdown et al. · Astronomy and Astrophysics · 2020

   Final full-mission Planck cosmic microwave background data, with temperature, polarization and lensing, are used to measure cosmological parameters, finding good consistency with the standard six-parameter ΛCDM model.

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   1. UncheckedPlanck's combined analysis gives dark matter and baryon densities, spectral index and optical depth, each with stated 68% uncertainties, in base ΛCDM.“A combined analysis gives dark matter density Ω c h 2 = 0.120 ± 0.001, baryon density Ω b h 2 = 0.0224 ± 0.0001, scalar spectral index n s = 0.965 ± 0.004, and optical depth τ = 0.054 ± 0.007 (in this abstract we quote 68% confidence regions on measured parameters and 95% on upper limits).”
   2. UncheckedPlanck with BAO data gives N_eff = 2.99 ± 0.17, matching the Standard Model's 3.046, and limits the summed neutrino mass to below 0.12 eV.“Combining with baryon acoustic oscillation (BAO) measurements (and considering single-parameter extensions) we constrain the effective extra relativistic degrees of freedom to be N eff = 2.99 ± 0.17, in agreement with the Standard Model prediction N eff = 3.046, and find that the neutrino mass is t…”

2. Physics and Astronomy › Cosmology and Gravitation Theories

   The Atacama Cosmology Telescope: DR4 maps and cosmological parameters

   Aiola, Calabrese, Maurin et al. · Journal of Cosmology and Astroparticle Physics · 2020

   The paper presents new Atacama Cosmology Telescope maps of the cosmic microwave background and uses their power spectrum to measure cosmological parameters, finding the ΛCDM model fits well.

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   1. UncheckedCombining ACT with WMAP data gives a Hubble constant of 67.6 ± 1.1 km/s/Mpc; ACT alone gives 67.9 ± 1.5, as the paper reports.“By combining ACT data with large-scale information from WMAP we measure $H_0 = 67.6 \pm 1.1$ km/s/Mpc, at 68% confidence, in excellent agreement with the independently-measured Planck satellite estimate (from ACT alone we find $H_0 = 67.9 \pm 1.5$ km/s/Mpc).”
   2. Unchecked“The $Λ$CDM model provides a good fit to the ACT data, and we find no evidence for deviations: both the spatial curvature, and the departure from the standard lensing signal in the spectrum, are zero to within 1$σ$; the number of relativistic species, the pri…