Testing the consistency between cosmological data: the impact of spatial curvature and the dark energy EoS

Abstract

The results of joint analyses of available cosmological data have motivated an important debate about a possible detection of a non-zero spatial curvature. If confirmed, such a result would imply a change in our present understanding of cosmic evolution with important theoretical and observational consequences. In this paper we discuss the legitimacy of carrying out joint analyses with the currently available data sets and explore their implications for a non-flat universe and extensions of the standard cosmological model. We use a robust tension estimator to perform a quantitative analysis of the physical consistency between the latest data of Cosmic Microwave Background, type Ia supernovae, Baryonic Acoustic Oscillations and Cosmic Chronometers. We consider the flat and non-flat cases of the $\Lambda$CDM cosmology and of two dark energy models with a constant and varying dark energy EoS parameter. The present study allows us to better understand if possible inconsistencies between these data sets are significant enough to make the results of their joint analyses misleading, as well as the actual dependence of such results with the spatial curvature and dark energy parameterizations.

arXiv comment11 pages, 6 figures, 1 table

References in corpus (47)

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• 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
• Observational Probes of Cosmic Acceleration
• Constraints on the redshift dependence of the dark energy potential
• Tensions between the Early and the Late Universe
• A 6% measurement of the Hubble parameter at $z\sim 0.45$: direct evidence of the epoch of cosmic re-acceleration
• Cosmic Chronometers: Constraining the Equation of State of Dark Energy. I: H(z) Measurements
• Planck 2018 results. V. CMB power spectra and likelihoods
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Constraining Cosmological Parameters Based on Relative Galaxy Ages
• Planck 2018 results. VIII. Gravitational lensing
• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Age-dating Luminous Red Galaxies observed with the Southern African Large Telescope
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• WMAP constraints on low redshift evolution of dark energy
• Curvature tension: evidence for a closed universe
• First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters
• A parametric model for dark energy
• Eppur è piatto? The cosmic chronometer take on spatial curvature and cosmic concordance
• On the use of the local prior on the absolute magnitude of Type Ia supernovae in cosmological inference
• The evidence for a spatially flat Universe
• Tension between the power spectrum of density perturbations measured on large and small scales
• The galaxy power spectrum take on spatial curvature and cosmic concordance
• Quantifying tensions in cosmological parameters: Interpreting the DES evidence ratio
• Cosmological Constraints from DES Y1 Cluster Abundances and SPT Multi-wavelength data
• Using the tilted flat-$\Lambda$CDM and the untilted non-flat $\Lambda$CDM inflation models to measure cosmological parameters from a compilation of observational data
• Bayesian evidence as a tool for comparing datasets
• Assessing tension metrics with Dark Energy Survey and Planck data
• A generalized equation of state for dark energy
• Cosmological discordances II: Hubble constant, Planck and large-scale-structure data sets
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• Cosmological discordances: a new measure, marginalization effects, and application to geometry vs growth current data sets
• The Impact of the Fiducial Cosmology Assumption on BAO Cosmological Parameter Inference
• Oscillations in the dark energy EoS: new MCMC lessons
• Information Gains from Cosmic Microwave Background Experiments
• A Bayesian interpretation of inconsistency measures in cosmology
• Investigating the Hubble Constant Tension -- Two Numbers in the Standard Cosmological Model
• J-PAS: forecasts on dark energy and modified gravity theories
• Generalizing thawing dark energy models: the standard vis-à-vis model independent diagnostics

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