On dataset tensions and signatures of new cosmological physics

Abstract

Can new cosmic physics be uncovered through tensions amongst datasets? Tensions in parameter determinations amongst different types of cosmological observation, especially the `Hubble tension' between probes of the expansion rate, have been invoked as possible indicators of new physics, requiring extension of the $\Lambda$CDM paradigm to resolve. Within a fully Bayesian framework, we show that the standard tension metric gives only part of the updating of model probabilities, supplying a data co-dependence term that must be combined with the Bayes factors of individual datasets. This shows that, on its own, a reduction of dataset tension under an extension to $\Lambda$CDM is insufficient to demonstrate that the extended model is favoured. Any analysis that claims evidence for new physics {\it solely} on the basis of alleviating dataset tensions should be considered incomplete and suspect. We describe the implications of our results for the interpretation of the Hubble tension.

arXiv comment5 pages, matches MNRAS accepted version, corrections and updates to discussion of systematics, and other minor changes

References in corpus (43)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Planck 2013 results. XVI. Cosmological parameters
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Pantheon+ Analysis: Cosmological Constraints
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Tensions between the Early and the Late Universe
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• SALT2: using distant supernovae to improve the use of Type Ia supernovae as distance indicators
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• PolyChord: next-generation nested sampling
• How many cosmological parameters?
• The $H_0$ Olympics: A fair ranking of proposed models
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Data Calibration
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Modeling Uncertainty
• A Nested Sampling Algorithm for Cosmological Model Selection
• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• Concordance and Discordance in Cosmology
• Cosmic Microwave Weak lensing data as a test for the dark universe
• Consistency tests of $\Lambda$CDM from the early integrated Sachs-Wolfe effect: Implications for early-time new physics and the Hubble tension
• DES Y3 + KiDS-1000: Consistent cosmology combining cosmic shear surveys
• The KBC void and Hubble tension contradict $\Lambda$CDM on a Gpc scale $-$ Milgromian dynamics as a possible solution
• Quantifying tensions in cosmological parameters: Interpreting the DES evidence ratio
• Bayesian evidence as a tool for comparing datasets
• Insensitivity of The Distance Ladder Hubble Constant Determination to Cepheid Calibration Modeling Choices
• Can late-time extensions solve the $H_0$ and ${\sigma }_8$ tensions?
• A Lockdown Perspective on the Hubble Tension (with comments from the SH0ES team)
• Assessing tension metrics with Dark Energy Survey and Planck data
• Quantifying dimensionality: Bayesian cosmological model complexities
• Sensitivity of the Hubble Constant Determination to Cepheid Calibration
• The Hubble Tension Revisited: Additional Local Distance Ladder Uncertainties
• Cosmological discordances: a new measure, marginalization effects, and application to geometry vs growth current data sets
• Dark Energy Survey Year 1 Results: Joint Analysis of Galaxy Clustering, Galaxy Lensing, and CMB Lensing Two-point Functions
• Quantifying concordance of correlated cosmological data sets
• The power of Bayesian evidence in astronomy
• Ruling Out New Physics at Low Redshift as a solution to the $H_0$ Tension
• Robustness to systematics for future dark energy probes
• Concordance Cosmology?
• When tension is just a fluctuation: How noisy data affect model comparison
• Carnegie Supernova Project-I and -II: Measurements of $H_0$ using Cepheid, TRGB, and SBF Distance Calibration to Type Ia Supernovae
• Hubble tensions: a historical statistical analysis

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• Consistent extinction model for type Ia supernovae in Cepheid-based calibration galaxies and its impact on $H_0$
• On DESI's DR2 exclusion of $\Lambda$CDM
• Gravitational metamaterials from optical properties of spacetime media
• Addressing the $H_0$ tension through matter with pressure and no early dark energy
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