Sounds Discordant: Classical Distance Ladder and ΛCDM-based Determinations of the Cosmological Sound Horizon
By K. Aylor, M. Joy, Lloyd Knox, M. Millea, Srinivasan Raghunathan, W. Wu. Astrophysical Journal, 2018
232 citations recorded by the source corpus.
Type Ia supernovae, calibrated by classical distance ladder methods, can be used, in conjunction with galaxy survey two-point correlation functions, to empirically determine the size of the sound horizon rs. Assumption of the ΛCDM model, together with data to constrain its parameters, can also be used to determine the size of the sound horizon. Using a variety of cosmic microwave background (CMB) data sets to constrain ΛCDM parameters, we find the model-based sound horizon to be larger than the empirically determined one with a statistical significance of between 2σ and 3σ, depending on the data set. If reconciliation requires a change to the cosmological model, we argue that change is likely to be important in the two decades of scale factor evolution prior to recombination. Future CMB observations will therefore likely be able to test any such adjustments; e.g., a third-generation CMB survey like SPT-3G can achieve a threefold improvement in the constraints on rs in the ΛCDM model extended to allow additional light degrees of freedom.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/0d5d4bcfd2d55326e308abfb89631edd1a621a99
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In Astronomy and Astrophysics
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Citations in the corpus
- The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, background): “[68] Kevin Aylor, MacKenzie Joy, Lloyd Knox, Marius Millea, Srinivasan Raghunathan, and W.”
- Early Dark Energy can Resolve the Hubble Tension. (2018, methodology): “As shown by several recent studies [10,25,57], this can be recast as a mismatch between the sound horizon deduced from Planck data, and that reconstructed from the standard distance ladder.”
- The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters (2023, background): “This fact has motivated theoretical work to explain the tension by invoking new physics that decreases the physical size of the sound horizon at recombination by approximately 10% (e.g., Aylor et al. 2019; Knox & Millea 2020).”