The Atacama Cosmology Telescope: cosmological parameters from three seasons of data

By Jonathan Sievers, R. Hložek, M. Nolta, V. Acquaviva, G. Addison, P. Ade, P. Aguirre, M. Amiri, J. Appel, L. Barrientos and 83 more. 2013

348 citations recorded by the source corpus.

We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz and 218 GHz made by the Atacama Cosmology Telescope (ACT) in three seasons of observations from 2008 to 2010. A model of primary cosmological and secondary foreground parameters is fit to the map power spectra and lensing deflection power spectrum, including contributions from both the thermal Sunyaev-Zeldovich (tSZ) effect and the kinematic Sunyaev-Zeldovich (kSZ) effect, Poisson and correlated anisotropy from unresolved infrared sources, radio sources, and the correlation between the tSZ effect and infrared sources. The power ℓ2Cℓ/2π of the thermal SZ power spectrum at 148 GHz is measured to be 3.4±1.4 μK2 at ℓ = 3000, while the corresponding amplitude of the kinematic SZ power spectrum has a 95% confidence level upper limit of 8.6 μK2. Combining ACT power spectra with the WMAP 7-year temperature and polarization power spectra, we find excellent consistency with the LCDM model. We constrain the number of effective relativistic degrees of freedom in the early universe to be Neff = 2.79±0.56, in agreement with the canonical value of Neff = 3.046 for three massless neutrinos. We constrain the sum of the neutrino masses to be Σmν < 0.39 eV at 95% confidence when combining ACT and WMAP 7-year data with BAO and Hubble constant measurements. We constrain the amount of primordial helium to be Yp = 0.225±0.034, and measure no variation in the fine structure constant α since recombination, with α/α0 = 1.004±0.005. We also find no evidence for any running of the scalar spectral index, dns/dln k = −0.004±0.012.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/79ae3db809a185904432dbe5d65fe5582a7f9e5f

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Citations in the corpus

Any Light Particle Search II -- Technical Design Report (2013, background): “rom observation, here from cosmology. The energy density of relativistic particle species produced thermally in the big bang and present during the CMB times can be inferred from CMB data, see, e.g., [49, 50]. The WMAP analysis points towards an additional contribution to the radiation density beyon”
The Atacama Cosmology Telescope: temperature and gravitational lensing power spectrum measurements from three seasons of data (2013, methodology): “For some parameter runs, the lensing power spectrum information is added to the CMB power spectrum information (Sievers et al. 2013).”
THE 1% CONCORDANCE HUBBLE CONSTANT (2014, methodology): “06 eV and the helium consistency relationship in Equation 8 of Sievers et al. (2013). Where noted, we include the most recent ACT and SPT data (Section 2.”
The Phenomenology of Right Handed Neutrinos (2013, methodology): “this is consistent with the Neﬀ ≃ 4 predicted by a thermalized sterile neutrino with masses and mixing suggested by the oscillation anomalies, but also does not rule out the SS. In contrast, ACT+WMAP [293, 294] favours Neﬀ = 2.79 ± 0.56, which would clearly rule out thermal DR. This is in contrast t”
Neutrino masses and cosmology with Lyman-alpha forest power spectrum (2015, neutral): “013 when combining with WMAP-7 [35].”
Inflation and String Theory (2014, methodology): “Together with the measurements of the CMB damping tail by the Atacama Cosmology Telescope (ACT) [97,98] and the South Pole Telescope (SPT) [99, 100] this provides a beautiful picture of the first seven acoustic peaks of the CMB power spectrum.”
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity (2016, methodology): “There are also data sets where there is mild tension between measurements using the same probes: e.g. between the Planck 2015 results and those from combining WMAP, SPT, and ACT (Hinshaw et al. 2013; Story et al. 2013; Sievers et al. 2013; Calabrese et al. 2013).”
HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE REDSHIFT OF THE DECELERATION–ACCELERATION TRANSITION, DYNAMICAL DARK ENERGY, AND SPACE CURVATURE (2016, methodology): “…determinations of H0 from Wilkinson Microwave Anisotropy Probe, Atacama Cosmology Telescope, and Planck CMB anisotropy data (Hinshaw et al. 2013; Sievers et al. 2013; Ade et al. 2015; Addison et al. 2016), from BAO measurements (Aubourg et al. 2015; Ross et al. 2015; L’Huillier & Shafieloo…”
Hubble Parameter and Baryon Acoustic Oscillation Measurement Constraints on the Hubble Constant, the Deviation from the Spatially Flat ΛCDM Model, the Deceleration–Acceleration Transition Redshift, and Spatial Curvature (2017, result): “Many recent estimates of H0 are also quite consistent with the median statistics measurement (Calabrese et al. 2012; Sievers et al. 2013; Semiz & Kazım 2015; Aubourg et al. 2015; Luković et al. 2016; Planck Collaboration et al. 2016; Abbott et al. 2017; Lin & Ishak 2017; L’Huillier & Shafieloo…”
QUANTIFYING DISCORDANCE IN THE 2015 PLANCK CMB SPECTRUM (2015, methodology): “…Probe (WMAP) analysis (Bennett et al. 2013; Hinshaw et al. 2013), high-resolution ground-based instruments including the Atacama Cosmology Telescope (ACT; Sievers et al. 2013) and the South Pole Telescope (SPT; Story et al. 2013), and most recently Planck (Planck Collaboration XIII 2015).”
Planck 2015 results: XXIII. The thermal Sunyaev-Zeldovich effect-cosmic infrared background correlation (2015, neutral): “We also compare our modelling of the tSZ spectrum with ACT (Reichardt et al. 2012) and SPT (Sievers et al. 2013) measurement at high `.”