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Status: Unchecked ×Keyword: angular power spectrum ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $Λ$CDM Parameters

   Louis, La Posta, Atkins et al. · arXiv (Cornell University) · 2025

   The paper presents ACT Data Release 6 CMB power spectra and likelihoods, and uses them with Planck, lensing and DESI data to measure ΛCDM parameters and test extensions.

   Unchecked3 claims
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   1. UncheckedACT's measured CMB power spectra over 10,000 square degrees, down to arcminute scales, are well fit by CMB plus foregrounds, with the CMB following ΛCDM.“We find that the ACT angular power spectra estimated over 10,000 deg$^2$, and measured to arcminute scales in TT, TE and EE, are well fit by the sum of CMB and foregrounds, where the CMB spectra are described by the $Λ$CDM model.”
   2. UncheckedCombining ACT and Planck CMB data with CMB lensing and DESI DR1 gives a Hubble constant of 68.22 ± 0.36 km/s/Mpc within the ΛCDM model.“When combined with CMB lensing from ACT and Planck, and baryon acoustic oscillation data from DESI DR1, we measure a baryon density of $Ω_b h^2=0.0226\pm0.0001$, a cold dark matter density of $Ω_c h^2=0.118\pm0.001$, a Hubble constant of $H_0=68.22\pm0.36$ km/s/Mpc, a spectral index of $n_s=0.974\p…”
   3. UncheckedAdding DESI DR2 data gives H0 = 68.43 ± 0.27 km/s/Mpc, and ΛCDM parameters from P-ACT and DESI DR2 agree at the 1.6σ level.“Including the DESI DR2 data tightens the Hubble constant to $H_0=68.43\pm0.27$ km/s/Mpc; $Λ$CDM parameters agree between the P-ACT and DESI DR2 data at the $1.6σ$ level.”