Cosmological constraints on a unified dark matter-energy scalar field model with fast transition

Abstract

We test the viability of a single fluid cosmological model containing a transition from a dark-matter-like regime to a dark-energy-like regime. The fluid is a k-essence scalar field with a well-defined Lagrangian. We constrain its model parameters with a combination of geometric probes and conclude that the evidence for this model is similar to the evidence for $\Lambda$CDM. In addition, we find a lower bound for the rapidity of the transition, implying that fast transitions are favored with respect to slow ones even at background level.

12 pages, 4 figures. Matches published version in Physical Review D

References in corpus (14)

• Dynamics of dark energy
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Inflation, dark matter and dark energy in the string landscape
• Unified Dark Matter Scalar Field Models
• Bayesian Calibrated Significance Levels Applied to the Spectral Tilt and Hemispherical Asymmetry
• Attractor scenarios and superluminal signals in k-essence cosmology
• ISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
• Thermodynamics of k-essence
• Affine parameterization of the dark sector: costraints from WMAP5 and SDSS
• Holographic kinetic k-essence model
• Accelerating Hilbert-Einstein universe without dynamic dark energy
• Quantum cosmic models and thermodynamics
• Thermodynamics of the unified dark fluid with fast transition
• K-essential covariant holography

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• The Viability of Phantom Dark Energy: A Brief Review
• Implications of the Cosmic Birefringence Measurement for the Axion Dark Matter Search
• Bayesian analysis of a Unified Dark Matter model with transition: can it alleviate the $H_0$ tension?
• Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI