Concordance and discordance in cosmology

By M. Raveri, Wayne Hu. Physical Review D, 2018

137 citations recorded by the source corpus.

The success of present and future cosmological studies is tied to the ability to detect discrepancies in complex data sets within the framework of a cosmological model. Tensions caused by the presence of unknown systematic effects need to be isolated and corrected to increase the overall accuracy of parameter constraints, while discrepancies due to new physical phenomena need to be promptly identified. We develop a full set of estimators of internal and mutual agreement and disagreement, whose strengths complement each other. These allow to take into account the effect of prior information and compute the statistical significance of both tensions and confirmatory biases. We apply them to a wide range of state of the art cosmological probes and show that these estimators can be easily used, regardless of model and data complexity. We derive a series of results that show that discrepancies indeed arise within the standard LCDM model. Several of them exceed the probability threshold of 95% and deserve a dedicated effort to understand their origin.

Subfields: Astronomy and Astrophysics, Finance, Statistics and Probability

View Paper: https://www.semanticscholar.org/paper/a8f8676c807565c89290d93c39250da0f609170f

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Citations in the corpus

Early dark energy does not restore cosmological concordance (2020, methodology): “, [84–86]).”
The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, methodology): “[169] Marco Raveri and Wayne Hu, “Concordance and Discordance in Cosmology,” (2018), arXiv:1806.”
Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2019, background): “See Table 4 of Mandelbaum et al. (2018a) for the full description of the selection criteria.”
Early Dark Energy can Resolve the Hubble Tension. (2018, background): “[63]) and therefore deserves more attention in future work.”
KiDS+VIKING-450: Cosmic shear tomography with optical and infrared data (2018, background): “As shown by Köhlinger et al. (2019) the evidence ratio test described above is only a necessary condition for internal consistency (see also Raveri & Hu 2019).”
Resolving the Hubble tension with new early dark energy (2020, background): “The conclusion we draw from this is that whatever physics or systematics is responsible for this so-called S8 tension [113], it seems to be equally affecting NEDE and ΛCDM.”
Curvature tension: Evidence for a closed universe (2019, unknown): “Other tension metrics are also available [47–58].”
New physics in light of the H0 tension: An alternative view (2019, background): “[299] M.”