Unified Dark Matter scalar field models with fast transition

Abstract

We investigate the general properties of Unified Dark Matter (UDM) scalar field models with Lagrangians with a non-canonical kinetic term, looking specifically for models that can produce a fast transition between an early Einstein-de Sitter CDM-like era and a later Dark Energy like phase, similarly to the barotropic fluid UDM models in JCAP1001(2010)014. However, while the background evolution can be very similar in the two cases, the perturbations are naturally adiabatic in fluid models, while in the scalar field case they are necessarily non-adiabatic. The new approach to building UDM Lagrangians proposed here allows to escape the common problem of the fine-tuning of the parameters which plague many UDM models. We analyse the properties of perturbations in our model, focusing on the the evolution of the effective speed of sound and that of the Jeans length. With this insight, we can set theoretical constraints on the parameters of the model, predicting sufficient conditions for the model to be viable. An interesting feature of our models is that what can be interpreted as w_{DE} can be <-1 without violating the null energy conditions.

Slightly revised version accepted for publication in JCAP, with a few added references; 27 pages, 13 figures

References in corpus (27)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived Parameters
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• Can dark energy evolve to the Phantom?
• Cosmological Constraints from the Clustering of the Sloan Digital Sky Survey DR7 Luminous Red Galaxies
• Energy conditions in the epoch of galaxy formation
• Dust of Dark Energy
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Kinetic k-essence and Quintessence
• $\Lambda \alpha$DM: Observational constraints on unified dark matter with constant speed of sound
• A note on the equivalence of a barotropic perfect fluid with a K-essence scalar field
• Cosmo-dynamics and dark energy with a quadratic EoS: anisotropic models, large-scale perturbations and cosmological singularities
• Affine equation of state from quintessence and k-essence fields
• Cosmological tachyon condensation
• Unified dark energy and dark matter from a scalar field different from quintessence
• ISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
• Report by the ESA-ESO Working Group on Fundamental Cosmology
• A note on perfect scalar fields
• The Homogeneous Scalar Field and the Wet Dark Sides of the Universe
• Affine parameterization of the dark sector: costraints from WMAP5 and SDSS
• Halos of Unified Dark Matter Scalar Field
• Formation of caustics in Dirac-Born-Infeld type scalar field systems

Cited by in corpus (28)

• Constraints on the interacting vacuum -- geodesic CDM scenario
• Acoustic scale from the angular power spectra of SDSS-III DR8 photometric luminous galaxies
• Cosmological constraints on a decomposed Chaplygin gas
• Late-transition vs smooth $H(z)$ deformation models for the resolution of the Hubble crisis
• Observational constraints on Rastall's cosmology
• Healing the cosmological constant problem during inflation through a unified quasi-quintessence matter field
• Scale-Dependent Growth from a Transition in Dark Energy Dynamics
• Note on the thermodynamics and the speed of sound of a scalar field
• Does Quartessence Ease Tensions?
• Testing generalized logotropic models with cosmic growth
• Phenomenological models for Unified Dark Matter with fast transition
• Imprints of interacting dark energy on cosmological perturbations
• Cosmological dynamics of the general non-canonical scalar field models
• Bayesian analysis of a Unified Dark Matter model with transition: can it alleviate the $H_0$ tension?
• Cosmological constraints on a unified dark matter-energy scalar field model with fast transition
• Inclusive Constraints on Unified Dark Matter Models from Future Large-Scale Surveys
• Shan--Chen interacting vacuum cosmology
• First cosmological constraints on the Superfluid Chaplygin gas model
• A PAge-like Unified Dark Fluid Model
• Cosmological constrains on fast transition Unified Dark Energy/Matter models
• Quintessential Inflation, Unified Dark Energy and Dark Matter, and Higgs Mechanism
• Unified dark fluid with fast transition: including entropic perturbations
• Observational constraints on the unified dark matter and dark energy model based on the quark bag model
• Anisotropic Conformal Dark Gravity on the Lorentz Tangent Bundle Spacetime
• Early-Matter-Like Dark Energy and the Cosmic Microwave Background
• Quintessence, Unified Dark Energy and Dark Matter, and Confinement/Deconfinement Mechanism
• Physical Implications and Updated Observational Constraints of the PAge-like Unified Dark Fluid Model
• Phenomenology of Unified Dark Matter models with fast transition