Consistency of Planck, ACT and SPT constraints on magnetically assisted recombination and forecasts for future experiments

Abstract

Primordial magnetic fields can change the recombination history of the universe by inducing clumping in the baryon density at small scales. They were recently proposed as a candidate model to relieve the Hubble tension. We investigate the consistency of the constraints on a clumping factor parameter $b$ in a simplistic model, using the latest CMB data from Planck, ACT DR4 and SPT-3G 2018. For the combined CMB data alone, we find no evidence for clumping being different from zero, though when adding a prior on $H_0$ based on the latest distance-ladder analysis of the SH0ES team, we report a weak detection of $b$. Our analysis of simulated datasets shows that ACT DR4 has more constraining power with respect to SPT-3G 2018 due to the degeneracy breaking power of the TT band powers (not included in SPT). Simulations also suggest that the TE,EE power spectra of the two datasets should have the same constraining power. However, the ACT DR4 TE,EE constraint is tighter than expectations, while the SPT-3G 2018 one is looser. While this is compatible with statistical fluctuations, we explore systematic effects which may account for such deviations. Overall, the ACT results are only marginally consistent with Planck or SPT-3G, at the $2-3\sigma$ level within $\Lambda$CDM+$b$ and $\Lambda$CDM, while Planck and SPT-3G are in good agreement. Combining the CMB data together with BAO and SNIa provides an upper limit of b<0.4 at 95\% c.l. (b<0.5 without ACT). Adding a SH0ES-based prior on the Hubble constant gives $b=0.31_{-0.15}^{+0.11}$ and $H_0=69.28\pm 0.56$ km/s/Mpc ($b=0.41_{-018}^{+0.14}$ and $H_0=69.70\pm 0.63$ km/s/Mpc without ACT). Finally, we forecast constraints on $b$ for the full SPT-3G survey, Simons Observatory, and CMB-S4, finding improvements by factors of 1.5 (2.7 with Planck), 5.9 and 7.8, respectively, over Planck alone.

19 pages, 13 figures

References in corpus (33)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon acoustic oscillations with Lyman-$\alpha$ forests
• The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
• SPT-3G: A Next-Generation Cosmic Microwave Background Polarization Experiment on the South Pole Telescope
• Measurements of the E-Mode Polarization and Temperature-E-Mode Correlation of the CMB from SPT-3G 2018 Data
• Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension
• CMB anisotropies from primordial inhomogeneous magnetic fields
• The 21cm angular-power spectrum from the dark ages
• A radio ridge connecting two galaxy clusters in a filament of the cosmic web
• Progress on Cosmological Magnetic Fields
• CMB bispectrum from primordial magnetic fields on large angular scales
• The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
• Constraints on $\Lambda$CDM Extensions from the SPT-3G 2018 $EE$ and $TE$ Power Spectra
• Recombination-independent determination of the sound horizon and the Hubble constant from BAO
• Early-Universe-Physics Insensitive and Uncalibrated Cosmic Standards: Constraints on ${\Omega }_{\mathrm{m}}$ and Implications for the Hubble Tension
• Constraints on Primordial Magnetic Fields from Planck combined with the South Pole Telescope CMB B-mode polarization measurements
• Primordial Magnetic Field Limits from Cosmic Microwave Background Bispectrum of Magnetic Passive Scalar Modes
• Constraints on the Evolution of the Primordial Magnetic Field from the Small-Scale Cosmic Microwave Background Angular Anisotropy
• Cosmological Perturbations at Second Order and Recombination Perturbed
• CMB anisotropies due to cosmological magnetosonic waves
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR16 luminous red galaxy and emission line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space
• Observable primordial vector modes
• Entropy perturbations and large-scale magnetic fields
• Cosmic microwave background bispectrum of tensor passive modes induced from primordial magnetic fields
• CMB anisotropies in the presence of a stochastic magnetic field
• Can small-scale baryon inhomogeneities resolve the Hubble tension? An investigation with ACT DR4
• Small-scale clumping at recombination and the Hubble tension
• Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields
• Primordial Magnetic Helicity Constraints from WMAP Nine-Year Data
• Probing correlations of early magnetic fields using mu-distortion
• A 4% measurement of $H_0$ using the cumulative distribution of strong-lensing time delays in doubly-imaged quasars

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