Does Quartessence Ease Tensions?

Abstract

Tensions between cosmic microwave background observations and the growth of the large-scale structure inferred from late-time probes pose a serious challenge to the concordance $\Lambda$CDM cosmological model. State-of-the-art data from the Planck satellite predicts a higher rate of structure growth than what preferred by low-redshift observables. Such tension has hitherto eluded conclusive explanations in terms of straightforward modifications to $\Lambda$CDM, e.g. the inclusion of massive neutrinos or a dynamical dark energy component. Here, we investigate models of 'quartessence' -- a single dark component mimicking both dark matter and dark energy -- whose non-vanishing sound speed inhibits structure growth at late times on scales smaller than its corresponding Jeans' length. In principle, this could reconcile high- and low-redshift observations. We put this hypothesis to test against temperature and polarisation spectra from the latest Planck release, SDSS DR12 measurements of baryon acoustic oscillations and redshift-space distortions, and cosmic shear correlation functions from KiDS. This the first time that any specific model of quartessence is applied to actual data. We show that, if we naively apply $\Lambda$CDM nonlinear prescription to quartessence, the combined data sets allow for tight constraints on the model parameters. Apparently, quartessence alleviates the tension between the total matter fraction and late-time structure clustering, although in fact the tension is transferred from the latter to the quartessence sound speed parameter. However, we found that this strongly depends upon information from nonlinear scales. Indeed, if we relax this assumption, quartessence models appear still viable. For this reason, we argue that the nonlinear behaviour of quartessence deserves further investigation and may lead to a deeper understanding of the physics of the dark Universe.

8 pages, 6 figures, 1 table; matching published version

References in corpus (10)

• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in Fourier-space
• Concordance and Discordance in Cosmology
• No evidence for extensions to the standard cosmological model
• Tension between the power spectrum of density perturbations measured on large and small scales
• Unified Dark Matter Scalar Field Models
• Planck confronts large scale structure: methods to quantify discordance
• ISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
• Inclusive Constraints on Unified Dark Matter Models from Future Large-Scale Surveys
• Cosmological constraints on a unified dark matter-energy scalar field model with fast transition

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