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1,280 claims from 801 papers are on the record. 46 have been checked so far; the other 1,234 have no check with a result yet.

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Status: Unchecked ×Keyword: cosmological parameters ×Clear all

7 claims from 3 papers

1. Physics and Astronomy › Cosmology and Gravitation Theories

   The Pantheon+ Analysis: The Full Data Set and Light-curve Release

   Scolnic, Brout, Carr et al. · The Astrophysical Journal · 2022

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   1. Unchecked“The total number of light curves, which are compiled across 18 different surveys, is a significant increase from the first Pantheon analysis (1048 SNe), particularly at low redshift ( z ).”
   2. Unchecked“Furthermore, unlike in the Pantheon analysis, we include light curves for SNe with z < 0.01 such that SN systematic covariance can be included in a joint measurement of the Hubble constant ( H 0 ) and the dark energy equation-of-state parameter ( w ).”

2. Physics and Astronomy › Cosmology and Gravitation Theories

   The Pantheon+ Analysis: Cosmological Constraints

   Brout, Scolnic, Popovic et al. · The Astrophysical Journal · 2022

   The Pantheon+ analysis uses 1701 light curves of 1550 Type Ia supernovae to constrain cosmological parameters, including dark energy and the Hubble constant, with about twice the constraining power of the original Pantheon.

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   1. UncheckedUsing Type Ia supernovae alone and assuming a flat ΛCDM universe, the Pantheon+ analysis gives a matter density parameter Ω_M of 0.334 ± 0.018.“For a flat ΛCDM model, we find Ω M = 0.334 ± 0.018 from SNe Ia alone.”
   2. UncheckedIn a flat w0CDM model, Pantheon+ supernovae give w0 near −0.9 and, with CMB and BAO data, near −0.98, both consistent with a cosmological constant.“For a flat w 0 CDM model, we measure w 0 = −0.90 ± 0.14 from SNe Ia alone, H 0 = 73.5 ± 1.1 km s −1 Mpc −1 when including the Cepheid host distances and covariance (SH0ES), and w 0 = − 0.978 − 0.031 + 0.024 when combining the SN likelihood with Planck constraints from the cosmic microwave backgroun…”
   3. UncheckedThe paper finds that supernova-related systematic errors make up under a third of the uncertainty on H0 and do not account for the Hubble tension.“Finally, we find that systematic uncertainties in the use of SNe Ia along the distance ladder comprise less than one-third of the total uncertainty in the measurement of H 0 and cannot explain the present “Hubble tension” between local measurements and early universe predictions from the cosmologic…”

3. Physics and Astronomy › Cosmology and Gravitation Theories

   The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters

   Madhavacheril, Qu, Sherwin et al. · The Astrophysical Journal · 2024

   The paper presents cosmological constraints from the ACT DR6 CMB lensing map over 9400 sq. deg., alone and with Planck lensing, and compares them with galaxy lensing surveys and extensions of ΛCDM.

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   1. UncheckedCombining ACT CMB lensing with CMB anisotropies, the paper limits the summed neutrino masses to below 0.13 eV at 95% confidence.“We combine our CMB lensing measurements with CMB anisotropies to constrain extensions of $Λ$CDM, limiting the sum of the neutrino masses to $\sum m_ν < 0.13$ eV (95% c.l.), for example.”
   2. UncheckedRe-analysed with uniform assumptions, S_8 from KiDS, DES and HSC galaxy surveys comes out lower than from ACT+Planck CMB lensing, by 1.7 to 2.1 sigma.“To compare these constraints to those from the KiDS, DES, and HSC galaxy surveys, we revisit those data sets with a uniform set of assumptions, and find $S_8$ from all three surveys are lower than that from ACT+Planck lensing by varying levels ranging from 1.7-2.1$σ$.”